The angles inside a triangle always add up to 180 degrees.
The whole thing is one big triangle made of two smaller ones.
28 + 58 + 77 + x = 180
163 + x = 180
x = 180 - 163
x = 17
Answer:
Step-by-step explanation:
1) Use the given coordinate points to find the slope
m=
m=
2) plug the slope into slope-intercept form
y=
x+b
3) choose one point to use to plug into the equation to solve for b
4=
(-2)+b
4) solve for b.
b=
5) substitute the value for b into equation from step 2
y=
x+