Question

How many solutions does this linear system have?

y = 2x – 5

–8x – 4y = –20

Answer 1

B: One solution: (2.5, 0)

Explanation:

I got it right on Edge

Answer 2

2 solutions.

Explanation:

Rearrange the second equation:

-8x - 4y = -20

-4y = 8x - 20

Divide through by -4:

y = -2x + 5

and our first equation is

y = 2x - 5

Subtracting the 2 equations

0 = -2x -2x + 5 -(-5)

0 = -4x + 10

x = 5/2

and y = 2(5/2) - 5 = 0.

2 solutions.