You put $5,000 in a simple interest account at a bank. You earn $1,200in just 4 years. What is the annual interest rate for the account?

6%

Step-by-step explanation:

To solve this problem we can use a modified version of the simple interest formula which is shown below:

I = interest amount

P = principal amount

t = time (years)

Now, lets plug in the values:

The last step is to convert 0.06 into a percent:

0.06(100) = 6

The interest rate is 6%.

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

i think it is 18

step-by-step explanation: