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8x+3y=4 -7x+5y=-34

label Algebra
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schedule 1 Day
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use elimination to solve each system of equations

Mar 18th, 2015

8x+3y=4
-7x+5y=-3

multiply equation 1 by 7 and equation 2 by 8,

56x + 21y = 28
-56 + 40 x = -24
+       -          +
______________
        -19y = 52
y = -52/19

and from equation 1,

8x +3*-52/19 = 4
8x -156/19 =4
8x = 4+156/19
8x = 232/19
x = 232/(8*19) = 29/19

so, x =29/19 and y = -52/19.


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Mar 18th, 2015

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