Question 212996: solve the system by substitution for the following problem:
x+8y=-7
8x+9y=7
also need to see what ths looks like on a graph?
Thank you Found 2 solutions by drj, Earlsdon:Answer by drj(1380) (Show Source): You can put this solution on YOUR website! Solve the system by substitution for the following problem:
x+8y=-7
8x+9y=7
Also need to see what this looks like on a graph?
Here are the following steps to solve the system of equations by substitution.
Solve: We'll use substitution. After moving 8*y to the right, we get: , or . Substitute that
into another equation: and simplify: So, we know that y=-1.14545454545455. Since , x=2.1636363636364.
Answer: .
Here is the graph. Note the solution (x,y) as the intersection between the two lines.
I hope the above steps were helpful.
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Good luck in your studies!
Respectfully,
Dr J
Answer by Earlsdon(6294) (Show Source): You can put this solution on YOUR website! Solve: Rewrite this as: and substitute into the second equation. Simplify the left side. Add 56 to both sides. Divide both sides by -55. Now substitute this into the first equation and solve for x.