This is a more difficult one to explain. Let's start with the line to the right. It has a slope (m) of 
= -1 and a y-intercept of +3 (continue the line to see where it crosses the y-axis). So, the equation of that line is: y = -x + 3 when x ≥ 2. This can also be written as y = 3 - x when x ≥ 2. The only option that has that equation is A.
Answer: A
Well since the value of C has been given to you, plug it into the equation.
F = 1.8(10) + 32
F = 18 +32
F = 50
The temperature in Fahrenheit would be 50 degrees.
Is it y=mx+b because if it is then plug the numbers in
