SOLUTION: Find the values of x and y that solve the following system of equations: 3x - 4y = -17 4x - 7y = -21

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Question 317984: Find the values of x and y that solve the following system of equations:
3x - 4y = -17
4x - 7y = -21






Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
3x - 4y = -17
4x - 7y = -21
-----------------
|3 -4|
|4 -7|
Det = -21 - (-16)
Det = -5
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|-4 -17|
|-7 -21| = -x*Det
= 84 - 119 = -35
x = -7
------
-21 - 4y = -17
y = -1