Question

Solve the following system of equations with the substitution method.

{x+y=25
y=4x
(x,y)=( , )

Answer 1

(5,20)

Explanation:

x+y=25

If you substitute y=4x,

x+4x=25

Now add like terms

5x=25

Divide 5

x=5

Put it back into the equation

5+y=25

Subtract 5

y=20

Answer: (5,20)