Question

Solve using substitution.
8x + 5y = 4
x = 3
What is x and y?

Answer 1

Answer: x = 3 : y = -4

Explanation:

8x + 5y = 4

8(3) + 5y = 4

5y = 4 - 8(3)

5y = 4 - 24

5y = -20

(5y)/5 = -20/5

y = -4

Answer 2

Answer: y=-4

Explanation:

8(3)+5y=4

24+5y=4

subtract each side by 24

5y=-20

divide by 5

5 y=-4