Tthe 2 adjacent angles add up to 109 degrees.
so x + 91 + 101 + x = 180
2x + 192 = 180
2x = -12
x = -6 (answer)
f(x) = 4x + 3
That's one-to-one, a linear function that will give a different f(x) for each different x.
For the inverse let's swap x and y and solve for y
x = 4y + 3
x - 3 = 4y
y = (x- 3)/4
That's the inverse,
Answer: (x- 3)/4, second choice
The domain and range of the inverse is all real numbers. It's two lines; I'll leave the graphing to you.