Question

3) Solve the following system of equations using substitution.

(show your work 1 point) (correct answer 1 point)
x + y = 4

y=3x

Answer 1

x = 1

Explanation:

Solve the following system of equations using substitution.

x + y = 4

y = 3x

Take the first equation and substitute in the second for the value of y:

x + (3x) = 4

4x = 4

divide both sides by 4:

4x/4 = 4/4

x = 1

check: if x = 1

1 + (3*1) = 4

1 + 3 = 4

4 = 4