The human body generates about 400 btus of body heat per hour while active. if an office that is 18 ft × 38 ft × 12 ft has 12 workers, how many btus per cubic foot do they produce in 5 hours? (to the nearest tenth)

answer: 48

just remember to use pemdas:

parentheses

expressions

multiplication

division

addition

subtraction

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