72 degrees
(well it says answers need to be 20 words long.. So I wrote this)
The answer is 25, leave a like (:
Answer: y=-6x-57
Step-by-step explanation: the normal format of a linear equation is
y=(slope)x+y intercept. The slope is -6 so y=-6x+y intercept. Plugging in the cordinates, -3=-9(-6)+y intercept. We'll call the y intercept b. -3=54+b. Subtract 54 from both sides of the equation and you get b=-54. The linear equation is
y=-6x-57.
You can check by plugging in x= -9, and y= -3. -3=54-57. -3=-3
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There we go!
X + 3x-10 + 70-x = 180
3x = 120
X = 40
The size of the largest angle is 3x - 10, because it is the biggest side.
Hope it helps, have a great day!