Question

Solve the following system of equations:

-2x + y = 1
-4x + y = -1

Answer 1

(3, 1)

(-1, 3)

(-1, -3)

(1, 3)

Answer 2

@shinalcantara

Answer 3

-2x + y = 1

Add 2x to both sides:

y = 2x + 1

We can plug in 2x + 1 for 'y' in the 2nd equation:

-4x + 2x + 1 = -1

Add:

-2x + 1 = -1

Subtract 1 to both sides:

-2x = -2

Divide -2 to both sides.

What's -2 / -2? @domisreallytall

Answer 4

@domisreallytall Can you divide -2 and -2?

Answer 5

-1?

Answer 6

No, not quite.. -2 / -2 is 1..so that's our y-value.

Answer 7

so its a?

Answer 8

Sorry, 1 is our x-value..

Answer 9

Not y..

Answer 10

oh. so its D

Answer 11

Yep, you got it.

Answer 12

Thanks can you help me with 3 more?