Question

I need this for finals.

A: x = 7, y = 1.
B: x = 7, y = -1
C: x = 1, y = -7
D: x = -1, y = 6

Answer 1

B. x = 7; y = -1

Explanation:

xy = -7

x + y = 6

A and D don't work since the product of xy is not -7.

Try B: x = 7; y = -1

xy = -7

(7)(-1) = -7

-7 = -7

It works on the first equation.

x + y = 6

7 + (-1) = 6

6 = 6

It works on the second equation.

Answer: B. x = 7; y = -1