Question

one step equations (add/subtract)
score: 4/5 penalty: none
question
solve for r.
10 + r = 2
answer attempt 1 out of 2
r =

Explanation:

Step1: Isolate r

Subtract 10 from both sides of the equation $10 + r=2$. So, $10 + r-10=2 - 10$.

Step2: Simplify

On the left - hand side, $10-10 + r=r$, and on the right - hand side, $2-10=- 8$. So $r=-8$.

Answer:

$r = - 8$