jgarcia888 jgarcia888
  • 11-10-2017
  • Mathematics
contestada

How to solve using substitution y=3/4x+5 and 4x-3y=-1

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wuzzleluver
wuzzleluver wuzzleluver
  • 11-10-2017
So, since we know what is y= to. we are going to plug in that equation for y I n the 2nd equation.

for example:
y=3/4x+5
4x-3(3/4x+5)= -1
4x-9/4x+15=-1
16/4x-9/4x=-16
5/4x=-16
multiply by the reciprocal on both sides toget x.

4/5(5/4x)= (-16)4/5
x= -64/5 = -12 and 4/5ths
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