In in a random survey, 8 out of every 13 students were taking pre-algebra, how many students out of the larger population of 8,000 students would be taking pre-algebra?

4,923 students

Step-by-step explanation: If 8 of 13 students are taking Pre-Algebra, set up a proportion to solve for the number out of 8,000. $ 8/13 = x/8000$

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