A cell phone provider offers a plan that costs $40 per month plus $0.10 per text message sent or received. A comparable plan costs $50 per month but offers unlimited text messaging.

-4

step-by-step explanation:

do 6-10=

if u need it to be negative.

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:

c) the x-coordinate of the center of the circle increases by 3