Question

What is the soultion of the system 6x+8y=30 and 9x+9y=-18 by using elimination?

Answer 1

Try using http://www.cymath.com/

Answer 2

Multiply the first equation by 3 and the second equation by 2 to get \[ \begin {eqnarray*} 18x + 24y &=& 90, \\ 18x + 18y &=& -36. \end {eqnarray*} \]Subtracting, we get 6y = 126, so y = 21. Now we can substitute back into one of the equations to solve for x. Can you do that?

Answer 3

Thanks! I got it now