Determine if the statement is always, sometimes or never true.

an equilateral triangle is a regular polygon.

a. always
b. sometimes
c. never

Equilateral triangle is always a regular polygon

Step-by-step explanation:

We have to tell an equilateral triangle is a regular polygon.

Regular polygon is a polygon which has all angles and all sides are equal.

Equilateral triangle is a triangle with all three angles equal to 60° and all three sides equal.

Hence equilateral triangle is always a regular polygon

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