Question

What is the value of the x variable in the solution to the following system of equations?

4x + 2y = 12
x – y = 3

0

−3

3

2

Answer 1

Hint:
Substitution method.
Isolate y in the first equation:
4x + 2y = 12
2y = -4x + 12
y = -2x + 3
Substitute this in for the value of y in the second equation:
x – y = 3
x - (2x + 3) = 3
x - 2x - 3 = 3
-x - 3= 3
-x = 6

x = 6 /-1

Answer 2

or multiply second equation by 2 and add both the equations......

Answer 3

^That is a much easier way. (: