What is the percent increase from 12 to 60

400%

Step-by-step explanation: To find the percent increase, we divide the amount of change by the original number.

The amount of change is the difference between the 2 numbers which in this case is 60 - 12 or 48. The original number is 12.

So we have 48/12 which is 4.

Finally, remember that we want the percent increase.

So we need to write 4 as a percent by moving the decimal point two places to the right to get 400%. So when a number changes from 12 to 60, there's a 400% increase.

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