Question

What is the x-coordinate of the solution of the following system of equations?

3x + y = 6
x - y = 6

Answer 1

x = 3

Explanation:

Follow the elimination method like so:

3x + y = 6 The Ys cross each other out.

x - y = 6 Add to get:

4x = 12

4x = 12 Divide to get:

4 4

x = 3

Hope this helps! :)

Answer 2

x = 3

Explanation:

By rearranging the equations,

y = 6 - 3x

y = x - 6

x - 6 = 6 - 3x

4x - 6 = 6

4x = 12

x = 3