Why is it not proportional

Which graph shows a function with a range of all real numbers greater than or equal to -1

Which of these equations, when solved, gives a different value of x than the other three? a9.1 = -0.2x + 10 b10 = 9.1 + 0.2x c10 – 0.2x = 9.1 d9.1 – 10 = 0.2x

Write the fraction 9/50 as a decimal if needed round to the nearest hundredth