What is the value of the y variable in the solution to the following system of equations?
5x + 4y = 1
4x + 3y = -1

-7

7

9

-9

Question

What is the value of the y variable in the solution to the following system of equations?
5x + 4y = 1
4x + 3y = -1 

 -7 

 7 

 9 

 -9

anonymous · Answer

@Jhannybean help please

whpalmer4 · Answer

Why don't you multiply the first equation by -4, and the second equation by 5.  Add the two resultant equations together, and you should end up with an equation in terms of $y$.  Solve that for $y$ and you have your answer.

anonymous · Answer

so its -7?

whpalmer4 · Answer

show me your work so I can find your mistake :-)

anonymous · Answer

no its 9 I think

whpalmer4 · Answer

that's better.  -7 is a trap answer :-)

anonymous · Answer

lol thank you :)

anonymous · Answer

what about this?
 Solve the following system of equations.
 x - 2y = 6
2x - 4y = 10 

 Infinitely Many Solutions 

 No Solutions 

 (0, 0) 

 (6, 10)