16% of what number is 72?

450

Step-by-step explanation: Well we know that 16% means 16/100 since a percent just means over 100, of means times, what number means x, is, means equals, and 72 means 72.

So we have 16/100 · X = 72.

Notice that 16/100 can be reduced to 4/25.

So rewriting our problem we have 4x/25 = 72

To get rid of the fraction,

we multiply both sides of the equation by 25 and we have 4x = 1800.

Dividing both sides by 4, x = 450.

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

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step-by-step explanation: