Question

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

Answer 1

x = -2

y = 6

Explanation:

y= -3x

x + y =4

Substitute y = -3x from the first equation into the second equation

x + (-3x) = 4

Combine like terms

-2x = 4

Divide by -2

-2x/-2 = 4/-2

x = -2

Now find y

y = -3x

y = -3(-2)

y = 6