Suppose that C = a + bY, where C = consumption, a = consumption at zero income,

Question:

Suppose that C = a + bY, where C = consumption, a = consumption at zero income, b = slope, and Y = income.
a. Are C and Y positively related or are they negatively related?
b. If graphed, would the curve for this equation slope upward or slope downward?
c. Are the variables C and Y inversely related or directly related?
d. What is the value of C if a = 10, b = .50, and Y = 200?
e. What is the value of Y if C = 100, a = 10, and b = .25?