Question

Solve the following system of equations:

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

(3, 1)
(-1, 3)
(-1, -3)
(1, 3)

Answer 1

Thats wrong...

Answer 2

now im confused

Answer 3

ok lets use sustitution.

Answer 4

we will sub y=2x+1 into equation 2

Answer 5

-4x+2x+1=-1
combine like terms

Answer 6

2x+1=-1

Answer 7

careful it would be -2x+1=-1 now isolate x

Answer 8

oh yeah

Answer 9

x+1=-2

Answer 10

x=-1?

Answer 11

yep :)

Answer 12

whats next?

Answer 13

now we plug -1 into our equation 1
y=2(-1)+1

Answer 14

y=-1?

Answer 15

we made a mistake somewhere let me double check

Answer 16

Equation 1 ) y=2x+1
Equation 2) -4x+y=-1
-4x+(2x+1)=-1
-1 is right here :)
y=-2-1
y=-3

Answer 17

oh ok thanks for the help man!

Answer 18

No probs :)

Answer 19

so it would be (1,3)

Answer 20

the negative 1 on top should be postive it was a typo sorry :)