Maria bought seven boxes. a week later half of all her boxes were destroyed by a fire. there are now only 22 boxes left. with how many did she start with?

If half of her boxes were burned and 22 were left, that means that she started with 44 boxes.

78.59 is the mean

step-by-step explanation:

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