MATH SOLVE

5 months ago

Q:
# HELP FOR BRAINEST THANK YOU!

Accepted Solution

A:

An interesting question!

Instead of solving each set of non-linear system of equations 6 times, I will try a simpler way, which is more adapted to multiple choice questions. However, please be warned that this method will not improve immensely math skills, but will help with reasoning, and possibly a broader understand in system of equations.

For simplicity, I will denote the sets of system of non-linear equations by S={A,B,C,D,E,F} from left to right.

1. given solutions {(-2,3),(7,-6)}

We first check each member of S, i.e. A,B,C,D,E,F for the linear conditions.

A: x+y=-2+3=1 ≠ 3 so no

B: x-y=-2-3=-5 ≠ 1 so no

C: 2x+y=-2(2)+3=-1 ≠ 1 so no

D: x+2y=-2+3(2)=4 ≠ 2 so no

E: -x+y=2+3=5 ≠ 1 so no

F: x+y=-2+3=1 ≠ 3 so YES now check the other solution 7-6=-1 OK

Now check the non-linear condition for F:

S1: (-2,3)

y-15=3-15=-12

-x^2+4x=-(-2)^2+4*(-2)=-12 good

S2:(7,-6)

y-15=-6-15=-21

-x^2+4x=-(7^2)+4(7)=-49+28=-21 also good,

So Solution set (1) matches tile F

(2) Given solutions {(-5,8),(3,0)}

We proceed in a similar way, to find that

-5+8=3 & 3+0=3 (matches A) and nothing else.

Check non-linear conditions (optionally, I transposed the terms to make comparison easier)

A. x^2+x-y=(-5)^2+(-5)-8=25-5-8=12 (looks good)

x^2+x-y=(3)^2+(3)-0=9+3=12 (looks even better)

So we determined that {(-5,8),(3,0)} is the solution for tile A.

(3) For solution set {(-2,5),(3,-5)}

Check linear conditions:

x+y=3 and -3, so does not satisfy A,& F.

x-y=-7 and 8, so does not satisfy B

2x+y=5 and 1 so satisfies C

x+2y=8 & -7 so does not satisfy D

-x+y=7 & -8 so does not satisfy E

Thus C is our only set. NOTE: if two distinct points satisfy one linear condition (say C), then both points cannot satisfy another non-equivalent linear condition, i.e. we didn't really have to check points D & E (which are not equivalent linear conditions as C) once we have found C.

Now check non-linear conditions:

x^2-3x-y=(-2)^2-3(-2)-5=5 ok

x^2-3x-y=(3)^2-3(3)-(-5)=5 ok

So solution set (3) matches tile C.

@officiallyqueenz, for your benefit, I will leave one for you as exercise. Please proceed to find the system for solution set (4). Post a your work as comments if you get stuck, or your answer for verification if you wish.

For those who consider this answer as incomplete, please feel free to report the above answer. At his/her discretion, moderator may delete answer as incomplete, may delete the whole question as too many questions, or then again, may leave the answer intact for the better learning of the user who posed the question.

User is free to ask for explanations, further help or answer check.

If applicable, whatever action a moderator takes in this respect will be final.

Instead of solving each set of non-linear system of equations 6 times, I will try a simpler way, which is more adapted to multiple choice questions. However, please be warned that this method will not improve immensely math skills, but will help with reasoning, and possibly a broader understand in system of equations.

For simplicity, I will denote the sets of system of non-linear equations by S={A,B,C,D,E,F} from left to right.

1. given solutions {(-2,3),(7,-6)}

We first check each member of S, i.e. A,B,C,D,E,F for the linear conditions.

A: x+y=-2+3=1 ≠ 3 so no

B: x-y=-2-3=-5 ≠ 1 so no

C: 2x+y=-2(2)+3=-1 ≠ 1 so no

D: x+2y=-2+3(2)=4 ≠ 2 so no

E: -x+y=2+3=5 ≠ 1 so no

F: x+y=-2+3=1 ≠ 3 so YES now check the other solution 7-6=-1 OK

Now check the non-linear condition for F:

S1: (-2,3)

y-15=3-15=-12

-x^2+4x=-(-2)^2+4*(-2)=-12 good

S2:(7,-6)

y-15=-6-15=-21

-x^2+4x=-(7^2)+4(7)=-49+28=-21 also good,

So Solution set (1) matches tile F

(2) Given solutions {(-5,8),(3,0)}

We proceed in a similar way, to find that

-5+8=3 & 3+0=3 (matches A) and nothing else.

Check non-linear conditions (optionally, I transposed the terms to make comparison easier)

A. x^2+x-y=(-5)^2+(-5)-8=25-5-8=12 (looks good)

x^2+x-y=(3)^2+(3)-0=9+3=12 (looks even better)

So we determined that {(-5,8),(3,0)} is the solution for tile A.

(3) For solution set {(-2,5),(3,-5)}

Check linear conditions:

x+y=3 and -3, so does not satisfy A,& F.

x-y=-7 and 8, so does not satisfy B

2x+y=5 and 1 so satisfies C

x+2y=8 & -7 so does not satisfy D

-x+y=7 & -8 so does not satisfy E

Thus C is our only set. NOTE: if two distinct points satisfy one linear condition (say C), then both points cannot satisfy another non-equivalent linear condition, i.e. we didn't really have to check points D & E (which are not equivalent linear conditions as C) once we have found C.

Now check non-linear conditions:

x^2-3x-y=(-2)^2-3(-2)-5=5 ok

x^2-3x-y=(3)^2-3(3)-(-5)=5 ok

So solution set (3) matches tile C.

@officiallyqueenz, for your benefit, I will leave one for you as exercise. Please proceed to find the system for solution set (4). Post a your work as comments if you get stuck, or your answer for verification if you wish.

For those who consider this answer as incomplete, please feel free to report the above answer. At his/her discretion, moderator may delete answer as incomplete, may delete the whole question as too many questions, or then again, may leave the answer intact for the better learning of the user who posed the question.

User is free to ask for explanations, further help or answer check.

If applicable, whatever action a moderator takes in this respect will be final.