Please help me solve

x=26

Step-by-step explanation:

2x+3x+50=180   add like terms

5x+50=180   subtract both sides by 50

5x=130   divide both sides by 5

x=26

x = 26

Step-by-step explanation:

The sum of the 3 angles in a triangle = 180°

sum the 3 angles and equate to 180

2x + 3x + 50 = 180

5x + 50 = 180 ( subtract 50 from both sides )

5x = 130 ( divide both sides by 5 )

x = 26

5   1/4   miles per hour

step-by-step explanation:

15   3/4 / 3 = 5   1/4

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