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Addition and Subtraction of Algebraic Equations

Find the valu...

Question

Find the value of a form the equation 5x-7y+6a=0 if its one solution is x=2,y=1.

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Solution

5x-7y+6a=0 one solution is x=2,y=1.

Substitute for x and y
5X2-7X1+6a=0

10-7+6a=0

3+6a=0

a=-3/6=-1/2

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