-20 = - 10s

To solve for s, we can divide both sides of the equation by -10:

-20 / -10 = -10s / -10

2 = s

10 = -5y

To solve for y, we can divide both sides of the equation by -5:

10 / -5 = -5y / -5

-2 = y

To solve the equation -20 = -10s, we can begin by isolating the variable s (solving for s). Here are the steps to do that:

Step 1: Divide both sides of the equation by -10 to isolate the variable s.

(-20) / (-10) = (-10s) / (-10)

Simplifying further:

2 = s

So, the solution to the equation is s = 2.