Question

How many solutions does this linear system have?

y=2x-5
-8x-4y=-20
A.One solution (-2.5,0)
B.One Solution (2.5,0)
C.No Solution
D.Infinite Number of Solutions

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)