Help me out?

Question

2x+y=9

4x-y=-15

Answer 1

This web site should help you out.

You will need to learn it sooner or later.

So, do not put off until tomorrow what you can learn today.

http://www.coolmathalgebra.com/

Answer 2

ok start with the first part 2x+y=9, you isolate the y by subtracting 2x from both sides of the equation so now y=9-2x.

Then you plug "y" value into the bottom equation...

4x-y=-15 is the same as  4x -(9-2x)=-15 than you work out the parentheses and you get 4x -9+2x=15

-Subtract 9 from both  sides and you get 4x+2x=6.  So 6x=6, they divide both sides by 6 and you get x=1.

Pretty sure this is correct but I haven't taken algebra in over 5 yrs. Good luck.

Answer 3

I really don't think that getting others to do your schoolwork is the best approach to an education.

Answer 4

2x + y = 9

4x - y = -15

y = 4x + 15

2x + (4x + 15) = 9

6x + 15 = 9

6x = -6

x = -1

2(-1) + y = 9

-2 + y = 9

y = 11

(x,y) = (-1, 11)

EDIT: the person above me made a mistake when going from  4x -(9-2x) = -15

to      4x -9 + 2x =15

they dropped the negative on the 15, probably a small slip-up. that's why they got x =1 as opposed to x =-1

just wanted to clear that up.