There are 19 green marbles in a box. The number of green marbles in the box is 6 more than half the number of red marbles in the box. Write an algebraic equation to represent r, the number of red marbles in the box.

Answer Answer R = 2 (G-6)

:G=19

G=.5R+6

19=.5R+6

-6=.5R-6

13.=.5R

Divide by 5

R = 26

r = 2 (19-6)

Step-by-step explanation:

19 is the number of green. 19 also is equal to (r/2 + 6)

so 19 = r/2 + 6 rearrange for R = 2 (19-6)

subtract 6 from both sides, then multiply by 2 to cancel the denominator.

19 - 6 = r/2 13 = r/2

2 (13) = r

r = 26