Please help im stuck on some math here

  -40

Step-by-step explanation:

This is a "two-step" linear equation.

First step: eliminate the constant +5 on the left by adding its opposite.

  y/-4 +5 -5 = 15 -5

  y/-4 = 10

Second step: eliminate the 'divided by' by multiplying by that amount:

  -4(y/-4) = -4(10)

  y = -40

Of course, whatever we do to one side of the equation (add, multiply), we must also do to the other side of the equation. That is how the equal sign stays valid.

1. perpendicular

2. parallel

3. perpendicular

step-by-step explanation:

6