Question

Which options shows the correct first step to solve the system of equations?

5x + 3y = 4
y = 2x
O 5x+3(5x)=4
O 5(2x)+3y=4
O 5x+3(2x)=4
O 5x+3y=2x

Answer 1

Answer: 5x+3(2x)=4

Explanation:

5x+3y=4 (1)

y=2x (2)

Substitute the equation (2) into the equation (1):

5x+3(2x)=4