Two lines, A and B, are represented by equations given below:

Line A: y = x − 4
Line B: y = 3x + 4

Which of the following shows the solution to the system of equations and explains why?

Question

Two lines, A and B, are represented by equations given below:

Line A: y = x − 4
Line B: y = 3x + 4

Which of the following shows the solution to the system of equations and explains why?

pooja195 · Answer

it tells you what y equals right ? 
so lets plug equation 1 into equation 2 
x-4=3x + 4

pooja195 · Answer

solve for x

anonymous · Answer

-4?

anonymous · Answer

@pooja195

pooja195 · Answer

good :) now we need to plug that into equation 1 :P  
-4-4=?

anonymous · Answer

-8, but because why? because it satisfies both equations or because the point does not lie on any axis? @pooja195

pooja195 · Answer

we have 
(-4,-8) as the solution 
We plug -4 into the other equation to find the value of y