Question 641901
5y=-1+10x 


2*5y=2*(-1+10x)


10y = -2+20x

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15x-10y=1


15x-(-2+20x)=1


15x+2-20x = 1


-5x+2 = 1


-5x = 1-2


-5x = -1


x = -1/(-5)


x = 1/5


Now use this to find y.