Does anyone know how to do systems of equations?

Question

anonymous · Answer

8x + 5y = 9
3x + 2y = 4

hero · Answer

I'd at least multiply both sides of the second equation by 2 to get

8x + 5y = 9
6x + 4y = 8

This way, when you subtract the equations you get

2x + y = 1

and 

y = -2x + 1

Now you could simply substitute y back into the first equation to get:
8x + 5(-2x + 1) = 9

Which will give you an equation in one variable. Solve for x.

hero · Answer

Let me know what you end up getting for x and y.

anonymous · Answer

Would it be -2,5 for the answer?

hero · Answer

8x - 10x + 5 = 9
-2x = 4
   x = 4/-2
   x = -2

3(-2) + 2(y) = 4
-6 + 2y = 4
2y = 10
  y = 10/2
  y = 5

Correct

anonymous · Answer

Thanks for ur help!

hero · Answer

You're welcome.