Question

x - y = 4
x + y = 8

The x-coordinate of the solution to the system shown is _____.

Answer 1

think of two numbers that add to 8 and are 4 apart
probably can guess in one or at most two tries

Answer 2

what is 8-4? then what is 4+4? then you will get your answer:)

Answer 3

Add both the equations and y will be eliminated. Find x.

Answer 4

y=8-x
x-(8-x)=4
x-8+x=4
2x=4+8
x=(4+8)/2
x=6
y=8-x
y=8-6=2
x=6
y=2