Question

solve by substitution

3x+2y=-5
x=57-8y

Answer 1

3x+2y=-5
3+-8=-5
x=1 y=-4

x=57-8y Are you supposed to plug in the Y from the first problem? If so, then:
x=57-8(-4)
x=57+32
x=89

Answer 2

Something about that just looks very wrong

Answer 3

I need more directions besides just the problem.

Answer 4

The only thing that is needed is to be familiar with solving systems of equations.

Answer 5

Solving by substitution:

We're given an equation:
3x+2y=-5

We are also given an expression that is equal to x:
x=57-8y

Therefore, we can substitute the expression that equals x into the first equation:

So:
3x + 2y = -5 becomes 3(57-8y) + 2y = -5

From there, you can simplify and solve for y.

Answer 6

If you do that you will get:

3(57 - 8y) + 2y = -5
171 - 24y + 2y = -5
171 - 22y = -5
171 + 5 = 22y
176 = 22y
176/22 = y
8 = y

Answer 7

Since y = 8, We can find x by substituting 8 back into the original equation:

3x + 2y = -5
3x + 2(8) = -5
3x + 16 = -5
3x = -5 - 16
3x = -21
x = -21/3
x = -7

So the solution to this system is x = -7, y = 8 or simply (-7,8).