Joelle had $24 to spend on seven pencils. after buying them she had $10. how much did each pencil cost?

She had $24 and had left $10. We subtract to find out the amount of money the pencils cost.

$24 - $10 = $14

She spent $14 on the 7 pencils. Now we divide the total amount spent ($14) by the number of pencils (7) to find out the amount each pencil cost.

$14/7 = $2

Each pencil cost $2.

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