Question

How many solutions does this linear system have?

y=2x-5
-8x - 4y=-20

one solution: (-2.5, 0)
one solution: (25,0)
no solution
infinite number of solutions

Answer 1

one solution: (2.5,0)

Explanation:

Answer 2

The solution is (0.4;-4.2). I'm not sure since my solution is none of your alternatives, but I don't think I have made any mistakes.

Explanation:

Replace the y at the second eq.

-8x-4(2x-5)=-20

-16x+20=-20

-16x=-40

x=0.4

Therefore y equals:

2×0.4-5=-4.2