Find X. I'm having trouble with this one as well.

Step-by-step explanation:

All of the angles in a triangle add up to 180° So make an equation by adding up all the angles and set it equal to 180. (2x-18) + (3x - 12) + 40 = 180

Combine like terms.

5x -18 - 12 + 40 = 180. Add up all the constants (plain numbers with no x)

5x + 10 =180 Subtract 10 from both sides

5x = 170 Divide both sides by 5

x = 34

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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