Question

Use substitution to solve the system of equations given by y=2x and 5x+y=7.

Solution = ( , )

Answer 1

1 , 2

Explanation:

y = 2x --------------(I)

5x + y = 7 ------------(II)

Substitute y = 2x in equation (II)

5x + 2x = 7

7x = 7

Divide both sides by 7

x = 7/7

x = 1

Plugin x = 1 in (II)

y = 2*1

y = 2