zaniyahm06 zaniyahm06
  • 15-03-2021
  • Mathematics
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when solving the following system of equations by substitution what would be a correct first step x=y–7 3x+15y=-1

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leaalibeg
leaalibeg leaalibeg
  • 15-03-2021

Answer:

The first step is to replace the value of x from the first equation with x in the second equation:

x=y-7

3x+15y=-1

3(y-7)+15y=-1        

3y-21+15y=-1

18y=-1+21

18y=20

y= [tex]\frac{20}{18}[/tex] = [tex]\frac{10}{9}[/tex]

x= [tex]\frac{10}{9}[/tex] [tex]- 7[/tex]

x=[tex]- \frac{53}{9}[/tex]

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