SOLUTION: y=5x-8 5y=2x+6 i dont understand how to substitute.. i think its solve for y.. then substitute it in the second equation.... right?

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Question 379973: y=5x-8
5y=2x+6
i dont understand how to substitute.. i think its solve for y.. then substitute it in the second equation.... right?
Found 2 solutions by stanbon, robertb:
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
y=5x-8
5y=2x+6
i dont understand how to substitute.. i think its solve for y.. then substitute it in the second equation.... right?
------------------
RIGHT.
Since y = 5x-8, substitute for y in the 2nd equation
and solve for "x":
---
5(5x-8) = 2x+6
25x-40 = 2x+6
23x = 46
x = 2
----
Since y = 5x-8, y = 5*2-8 = 2
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Cheers,
Stan H.
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Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
Right. After substituting y into the bottom equation, you should get 5(5x-8) = 2x + 6. From here you can solve for x. After solving for x, get back to the top eqaution y = 5x - 8, and then solve for y. =)