Question

Which of the following ordered pairs is a solution of the given system of linear equations?

Answer 1

The answer is D

5+4=9 and 9=9 (from the first equation)

5-0.5(4)= 5-2=3 and 3=3

Hope this helped

Answer 2

x + y = 9
x = 9 - y

x - 1/2y = 3...multiply by 2
2x - y = 6

2(9 - y) = 6
18 - 2y = 6
-2y = 6 - 18
-2y = - 12
y = -12/-2
y = 6

x + y = 9
x + 6 = 9
x = 9 - 6
x = 3

solution is (3,6)