Question

5x + 2y = 8

x + y = 4

If you want to solve the system of equations by addition, which of the following could you do?

(A.) Multiply the second equation by 5 and add.
(B.) Multiply the second equation by 2 and add.
(C.) Multiply the second equation by -2 and add.

Answer 1

Explanation:

The solution is C

5x + 2y = 8

-2x -2y= -8

3x = 0

x = 0

2y = 8

y = 4

(0,4)

Answer 2

Answer: C. Multiply the second equation by -2 and add

Explanation: