Question

Is (-2, 1) a solution of the following system of equations?

2x + y = -3
y = 2x + 5
A) yes
B
no

Answer 1

Answer: A; Yes

Explanation:

Plug in the ordered pair into the equation: 2(-2) + (1) = -3

Solve: -4 + 1 = -3

-3 = 3 ; (-2, 1) is a solution for 2x + y = -3

Now, repeat the same process for the second equation:

(1) = 2(-2) + 5

1 = -4 + 5

1 = 1 ; (-2, 1) is a solution for y = 2x + 5