Question

What is the x-value of the solution to this system of equations?

X = 2y-3
4X+9y=-63

A :60/17
B : -9
C : -3
D : -17/4

Answer 1

1) Plug in for x into the equation
4(2y-3)+9y=-63
8y-12+9y
17y-12=-63
y=-3

2) Plug in for y into the equation
4x+9(-3)=-63
4x-27=-63
+27. +27
4x=-36
-36/4= -9
x=-9


(-9,-3)
Now check by pluging in for x and y and see if the equation is true.
4(-9)+9(-3)
-36 + -27= -63