Question

How many solutions does this linear system have?

Answer 1

You can simplify the second equation by divining both sides by 4
Which gives you -2x -y =-5
Rearrange the terms and it'll give you y=-2x+5

Answer 2

B. y=2x-5
    -4y=8x-20
    y=-2x+5
    2x-5=-2x+5
        x=2.5
    2x*2.5-5=0
    -2x*2.5+5=0
so (2.5,0)