Question

Solve using elimination.

3x + 9y = –15
–5x − 9y = –5

Answer 1

(x, y) = (10, -5)

Explanation:

3x + 9y = -15 (eq 1)

-5x - 9y = -5 (eq 2)

add equation 1 and 2

3x + 9y -5x -9y = -15 - 5

-2x = -20

x = 10

put value of x in equation 1

3(10) + 9y =-15

30 + 9y = -15

9y = -45

y = -5