Line M is represented by the following equation: x - y = 8

Which equation completes the system that is satisfied by the solution (18, 10) ?

2x-y=26

x+t=18

2x-2y=36

x-y=-28

Let's plug in (18,10) into each answer choice until we find the one that has it as a solution.

A) 2x - y = 26

2 (18) - 10 = 26

36 - 10 = 26

26 = 26

Your answer is A.

I'll just do the rest to show that you the they are incorrect.

B) x + y = 18

18 + 10 = 18

28 ≠ 18

C) 2x - 2y = 36

2 (18) - 2 (10) = 36

36 - 20 = 36

16 ≠ 36

D) x - y = - 28

18 - 10 = - 28

8 ≠ - 28

Your answer is A) 2x - y = 26.