3.) AC is a segment and B is a point between A and C. If AB = 20 and BC = 15, find AC. 4.) AC is a segment and B is the midpoint of the segment. If AB = 3x - 20 and BC = 5x - 100, find the value of x.

3. 35

Step-by-step explanation:

15+20=35

y do u put "subscirbe to ence" on a app for ppl who need with their work?

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