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what is the answer to this systems of equations by substitution

8x-10y=-8

y=8

Guest Oct 26, 2017

Best Answer 

 #1
avatar+7336 
+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
 #1
avatar+7336 
+1
Best Answer

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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