Question

For the following system, use the second equation to make a substitution for y in the first equation. 2x + y = 5 y + 3 = 2x

2x + 2x - 3 = 5
2x + 3 - 2x = 5
2x + 2x + 3 = 5

Answer 1

Y=2x-3

The answer is 2x+2x-3=5

Answer 2

option A: 2x+2x-3=5

Explanation:

`2x + y = 5` is the first equation

`y+3=2x` is the second equation

We need to use the second equation to solve for y

`y+3=2x`

Subtract 3 from y to make y alone

`y=2x-3`

Now we plug in 2x-3 for y in first equation

`2x + y = 5`

`2x + 2x-3 = 5`

option A is correct