Doug has a shelf 9 3/4 inches long for storing CDs. Each CD is 3/8 inches wide. How many CDs will fit in one shelf?

26 CD's

Step-by-step explanation:

If the shelf is 9 3/4 inches long, and each CD is 3/8, all we have to do is divide. We get 26.

First:

Convert any mixed numbers to fractions.

Then your equation becomes:

39/4÷3/8

Applying the fractions formula for division,

=39×8/4×3

=312/12

Simplifying 312/12, the answer is

=26

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18