Question

x - y = 4
x + y = 8
The x-coordinate of the solution to the system shown is ___.
2
4
6
12

Answer 1

Again, solve by substitution:
x = 4 + y
4 + y + y = 8 -> y = 2.
Substituting back at the first equation:
x = 4 + 2 -> x = 6