Question

Choose the correct graph of the given system of equations.

y + 2x = −1
3y − x = 4

Answer 1

or none of the above

Answer 2

solve the first equation for y

y + 2x = −1

y = −1 - 2x


then plug this into the second equation and solve for x


3y − x = 4

3(-1 - 2x) − x = 4

-3 - 6x - x = 4

x = ??

Answer 3

-3-6x-x=4
-3-7x=4
+3 +3
-7/-7x=7/-7
x=-1

is that correct?

Answer 4

yep

Answer 5

y = -1 - 2x

y = -1 - 2(-1) ... plug in x = -1

y = ???

Answer 6

y=1

is that right?

Answer 7

yep

Answer 8

so x = -1 and y = 1

the two lines intersect at the point (-1,1)

Answer 9

Thank You!!!!!!!^-^

Answer 10

yw