It will be 69 degrees.
(x-1)+x+43=180
2x+42=180
2x=138
x=69
The equation of the line is (slope-intercept) y=

x+(-7) or (standard form)

x+y=-7
Depends on what you're trying to study
Turn phrases into mathmatical expressions:
"<span>one side(s) twice the length of the shortest side(x)" = 2x
"</span><span>the third side(t) is 30 feet more than the length of the shortest side " = x+30
</span>Shortest side= x
Perimeter= side1+ side 2 + side 3
138ft= x+2x+x+30
138= 4x+30
108=4x
x= 27 feet
Answer:
The shortest side is 27ft. The middle side 2x= 2(27)= 54ft. The longest side being x+30= 27+30= 57ft.