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  • 18-11-2016
  • Mathematics
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What is the solution to this system of equations?

-3x - 3y = 3

y= 7x +15

Please write your answer as an ordered pair.

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Аноним Аноним
  • 18-11-2016

-3x - 3y = 3

y= 7x +15

replace 
y= 7x +15 into -3x - 3y = 3
-3x - 3(7x+15) = 3
-3x -21x - 45 = 3
-24x = 48
x = 48/-24
x = -2

y= 7x +15
y= 7(-2) +15
y = -14 + 15
y = 1

solution (-2,1)
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