What is the perimeter of a triangle with side lengths of 3.5 m, 6.25 m and 9 m? m Group of answer choices

18.75

9.84

18.00

6.69

18.75 m

Step-by-step explanation:

For the perimeter just add all the sides togheter: 3.5+6.25+9= 18.75m

it's

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