SOLUTION: Can you help me solve this using substitution method. 1) 3x+8y=20 y=-2x+9 2) y=-5x-23 -5x+4y=8 Please respond quickly this is due tomorrow and i need hep immediately.

Algebra ->  Expressions-with-variables -> SOLUTION: Can you help me solve this using substitution method. 1) 3x+8y=20 y=-2x+9 2) y=-5x-23 -5x+4y=8 Please respond quickly this is due tomorrow and i need hep immediately.       Log On


   

Question 849569: Can you help me solve this using substitution method.
1)
3x+8y=20
y=-2x+9
2)
y=-5x-23
-5x+4y=8
Please respond quickly this is due tomorrow and i need hep immediately.
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
I will give a little help for number one.

Substitution is what you want.
3x%2B8y=20, and you have as the other equation, a formula for y.
3x%2B8%28-2x%2B9%29=20
Simplify and solve for x; and then use the result to evaluate y.