Solve the system by substitution.

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y=20x+20

-x-2y=1

Apr 2nd, 2015

y =20x+20

-x-2(20x+20) =1

-x-40x-40 =1

-41x = 1+40 

-41x= 41

x = 41/(-41) = -1

y = 20* (-1)+20 = -20+20=0

Answer: x = -1    ;   y =0  

Apr 2nd, 2015

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Apr 2nd, 2015

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Apr 2nd, 2015

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