Question

Solve the system by substitution. minus, 8, x, minus, 3, y, equals, 15 −8x−3y= 15 minus, 2, x, plus, 1, equals, y −2x+1= y

Answer 1

The solution of the system of equations is (-9, 19)

How to solve the system of equations?

Here we have the system of equations:

-8x -3y = 15

And the other equation is:

-2x + 1 = y

First, we can see that y is already isolated in the second equation, then we can substitute that in the other equation, we will get:

-8x - 3*(-2x + 1) = 15

-8x + 6x - 3 = 15

-2x - 3 = 15

-2x = 18

x = 18/-2 = -9

And then the value of y is:

y = -2x + 1

y = -2*-9 + 1

y = 19