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qaws [65]
3 years ago
15

-3x-3y=3 5x+y=-17 Substitution What does x and what does y equal

Mathematics
2 answers:
earnstyle [38]3 years ago
5 0

Answer:

x=-4\\\\y=3

Step-by-step explanation:

Given Equations:

-3x-3y=3      Equation:1

5x+y=-17      Equation:2

Solving Equation:2 for the value of 'y'

5x+y=-17

Subtracting '5x' both sides:

y=-17-5x  Equation:3

Using substitution method:    Put the value of 'y' in equation:1

            -3x-3y=3

        -3x-3(-17-5x)=3\\\\-3x-3(-17)-3(-5x)=3\\\\-3x+51+15x=3\\\\12x+51=3\\\\

Subtracting '51' both sides:

          12x=3-51\\\\12x=-48\\\\x=-48/12\\\\x=-4

Putting the value of 'x' in equation:3

        y=-17-5x

      y=-17-5(-4)\\\\y=-17+20\\\\y=3

The values of 'x' and 'y' are:

        x=-4\\\\y=3

bearhunter [10]3 years ago
5 0

Answer:

Step-by-step explanation:

-3x - 3y = 3 ---------(i)

5x + y = -17

       y = -5x - 17

Substitue y value in equation (i)

-3x - 3*(-5x - 17) = 3

-3x -3*(-5x) -3*(-17) =3

-3x + 15x + 51 = 3

12x + 51 = 3

12x = 3 - 51

12x = -48

x = -48/12

x =-4

Sustitute x value in Equation (i)

-3*(-4) - 3y = 3

12 - 3y = 3

-3y = 3 -12

-3y = -9

y =-9/-3

y = 3

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