If angle 2 congruent to angle 4 and angle 5 congruent to angle 7, which describes all the lines that must be parallel? a) Only lines r and s must be parallel.

b) Only lines t and u must be parallel.

c)Lines r and s and lines tand u must be parallel.

d) Neither lines rands nor lines t and u must be parallel.

c

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

answer: about 22.67

step-by-step explanation:

it is x=-4

step-by-step explanation: