Andy has a number of friends who like dressing as zombies for halloween. four kids dressed as zombies. the number increases by fifty percent. it increases by one third. how many people are dressing as zombies?

Step-by-step explanation:

4×0.5=2 (0.5=50%)

Add 2 to 4 and you get six.

1/3 of 6 is 2. Two goes into 6 3 times.

Add 2 to 6 and you get 8.

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