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# what is the answer to this systems of equations by substitution

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what is the answer to this systems of equations by substitution

8x-10y=-8

y=8

Guest Oct 26, 2017

#1
+6538
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8x - 10y  =  -8

y  =  8

Look at the first equation.

8x - 10y  =  -8         Now, since  y = 8 , we can replace  " y "  in this equation with  " 8 " .

8x - 10(8)  =  -8

And 10(8) = 80 .

8x - 80  =  -8

Add  80  to both sides of the equation.

8x  =  -8 + 80

8x  =  72

Divide both sides of the equation by  8 .

x  =  72/8

x  =  9

So the solutions are   x = 9   and   y = 8 .

hectictar  Oct 26, 2017
Sort:

#1
+6538
+1

8x - 10y  =  -8

y  =  8

Look at the first equation.

8x - 10y  =  -8         Now, since  y = 8 , we can replace  " y "  in this equation with  " 8 " .

8x - 10(8)  =  -8

And 10(8) = 80 .

8x - 80  =  -8

Add  80  to both sides of the equation.

8x  =  -8 + 80

8x  =  72

Divide both sides of the equation by  8 .

x  =  72/8

x  =  9

So the solutions are   x = 9   and   y = 8 .

hectictar  Oct 26, 2017

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