If you take out a loan that cost $561.60 over 8 years at an interest rate of 9% how much was the loan for?

$780

Step-by-step explanation:

From the question,

Principal= Unknown

Rate= 9%

Time= 8 years

Interest= $561.60

Since Interest= PRT/100

where P= Principal

R = Rate

T = Time

561.6 = (P × 9 × 8)/100

561.60 = 72P/100

Cross multiply

561.60 × 100 = 72P

56160 = 72P

Divide both side by 72

56160/72 = 72P/72

P = 780

The principal is $780.

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

answer: i don't understand it

step-by-step explanation: sorry