SOLUTION: 7x + 5y =77 3x- 4y = -10

Question 744227: 7x + 5y =77
3x- 4y = -10
Answer by Chipmonkcheeks(3) (Show Source): You can put this solution on YOUR website!
Call 7x + 5y = 77 equation I, and called 3x - 4y = -10 equation II.
Then from equation I, if you -5y from both sides of the equation:
,
Then dividing both sides by 7:
.
We can then substitute this expression for x into equation II. This gives us:
.
Expanding the brackets:
, which is equivalent to,
, which gives us that
.
Then substituting this back into our expression for x gives us:
,
which give us that

Best to check these answers by substituting them back into the original equations.
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