Question

3r − 9 = –6r solve for r

Answer 1

Answer:

$\boxed {r = 1}$

Step-by-step explanation:

Solve for the value of $r$:

$3r - 9 = -6r$

-Add $6r$ to $3r$:

$3r - 9 + 6r = -6r + 6r$

$9r - 9 = 0$

-Add $9$ on both sides:

$9r - 9 + 9 = 0 + 9$

$9r = 9$

-Divide both sides by $9$:

$\frac{9r}{9} = \frac{9}{9}$

$\boxed {r = 1}$

So, the value of $r$ is $1$.

Answer 2

Answer:

3r − 9 = –6r

-9 = -6r-3r         (you change the signs when bringing +3r to the other side)

-9 = -9r

r = -9/-9

r = 1