27 is 30 % of what number? Whole

90

Step-by-step explanation:

27 = 30%

Multiply both sides by 3:

81 = 90%

We need 10% more to get 100%, so since 27 is 30%, you need to divide 27 by 3 to get 10%:

9 = 10%

Add it to the previous equation:

90 = 100%

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