SOLUTION: 7x+10y=36 y=2x+9 solving systems of equations with substitution. I have been practicing these and i am pretty sure my math is correct but i need help i am doing khan academy

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Question 967313: 7x+10y=36
y=2x+9
solving systems of equations with substitution.
I have been practicing these and i am pretty sure my math is correct but i need help i am doing khan academy and the answers i got are x= -2 and y= 2.2
please help!
sincerely, kennedy
Found 2 solutions by josgarithmetic, MathTherapy:
Answer by josgarithmetic(39618)   (Show Source): You can put this solution on YOUR website!
substitute for y.
Solve for the value of y, fist.
Answer by MathTherapy(10552)   (Show Source): You can put this solution on YOUR website!

7x+10y=36
y=2x+9
solving systems of equations with substitution.
I have been practicing these and i am pretty sure my math is correct but i need help i am doing khan academy and the answers i got are x= -2 and y= 2.2
please help!
sincerely, kennedy 
Your value for x:  is correct. However, your y-value is not. 

You need to check your work to see where you went wrong. If you're unable to do so,

then repost and someone may be able to tell you where you went wrong. 

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