Question

Solve each system by substitution
y=4
-3x+5y=2

Answer 1

x = 6; y = 4

Explanation:

y=4

-3x+5y=2

-3x + 5(4) = 2

-3x + 20 = 2

-3x = -18

x = 6

Answer: x = 6; y = 4

Answer 2

(6,4)

Explanation:

y=4

-3x+5y=2

Substitute y=4 into the second equation

-3x+5*4=2

-3x +20 = 2

Subtract 20 from each side

-3x +20-20 = 2-20

-3x = -18

Divide by -3

-3x/-3 = -18/-3

x=6

(6,4)