Question

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 + y = 18
2x − 2y = 36
x − y = −28

Answer 1

Just plug in x = 18 and y = 10 into the 4 options and see which one fits

Answer 2

for example option 2:-

x + y = 18
x = 18 and y = 10
18 + 10 = 28 not 18 so its not this one.

Answer 3

i got my asnwer as c is that correct ?