4. What is the circumference of a circle with a diameter of 70 yd? Round your answer to the nearest yard. ( O 220 yd
O 1,540 yd
210 yd
440 yd

220 yd

Step-by-step explanation:

circumference = pie * diameter

c = pie * 70

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