Question

Which is the best first step in solving the following system of equations y=7x+3 y=9x

Answer 1

Replace the y value in y=7x+3 with 9x

Answer: x=3/2

Explanation:

y=7x+3; y=9x

9x=7x+3

Subtract 7x from both sides

2x=3

Divide by 2 on both sides

x=3/2

Answer 2

13.5 and 1.5

Explanation:

y=7x+3

y=9x

9x=7x+3

2x=3

x=3/2

y=9(3/2)

y=13.5