Help me plz i need help on this one

$247.50

Step-by-step explanation:

10 * 50 = 500

500 + 400 + 2100 = 3000

8.25/100 = 0.0825

3000 * 0.0825 = 247.5

$27.5

step-by-step explanation:

$110.00 divided by 4

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