3x+5y=1 3y-1=x

I need to substitute 3y-1=x  unto 3x+5y=11
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1 Answer

 3y-1=x

3x+5y=1

 

from equation 1 we know x, so plug that in to the 2nd to get

3(3y-1) + 5y = 1

9y - 3 + 5y = 1

14y = 4

y = 2/7.  Now plug that in to either equation to get x = -1/7

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