Question

I need help!

Answer 1

multiply the second equation by 2 and then add the two equations term by term u'll get the answer

Answer 2

and also the first equation must be in the same order as the second one

Answer 3

can you walk me through it?

Answer 4

did you realize?
do you need some more Explanation

Answer 5

here.i wrote it for you...

Answer 6

Oh! i get it now, when i would do it i would get either (4,-7) or (-4,-7) that makes so much more sense now! thank you!

Answer 7

Your Welcome :)

Answer 8

you could have also solved it by substitution...
we were given that y = -2x - 1
so sub -2x - 1 in for y in the other equation..
x + y = 3
x + (-2x - 1) = 3
x - 2x - 1 = 3
-x -1 = 3
-x = 3 + 1
-x = 4
x = -4
now sub -4 in for x
x + y = 3
-4 + y = 3
y = 3 + 4
y = 7