Question

Solve the following system of equations by graphing.

x + y = 8
x - 2y = -4

What is the y-value of their intersection?

-4
4
12
none of the above

Answer 1

this is what you are looking for
http://www.wolframalpha.com/input/?i=solve++x+%2B+y+%3D+8+and+x+-+2y+%3D+-4+

Answer 2

Oh heck no, the answer is Kush

Answer 3

i got -4?? hmmm

Answer 4

and I got kush.

Answer 5

what the heck isn't that w****

Answer 6

lets check ..
\[x + y = 8\]
\[x = 8 - y \] replace x = 8 - y in the equation : x - 2y = -8
\[8 - y - 2y = -4\]
\[-3y = -12\]
\[y = \frac{ 12 }{ 3 }\]
\[y = 4\] ( the y-value of intersection )

Answer 7

that makes sense thank you