B) P = 50 - P/2.
C) P = 10 -.2Qd.
D) P = 10 - 2Qd.
219) 
Refer to the above graph. Using Qs for quantity supplied and P for price, which of the following equations correctly states the supply of this product?
Refer to the above graph. Using Qs for quantity supplied and P for price, which of the following equations correctly states the supply of this product?
A) P = 4 +.2Qs.
B) P = 60/Qs.
C) P = 10Qs - 2P.
D) P = 2 +.2Qs.
220) Assume a household would consume $100 worth of goods and services per week if its weekly income were zero and would spend an additional $80 per week for each $100 of additional income. Letting C represent consumption and Y represent income, the equation which summarizes this relationship is:
A) C = 80 + 100Y.
B) C = 100 +.8Y.
C) C = 100 + 80Y.
D) C = 80 +.1Y.
221) 
In line (1) on the above graph, the variables x and y are:
In line (1) on the above graph, the variables x and y are:
A) nonlinearly related.
B) positively related.
C) negatively related.
D) inversely related.
222) 
In line (3) on the above graph, variables x and y are:
In line (3) on the above graph, variables x and y are:
A) directly related.
B) negatively related.
C) positively related.
D) nonlinearly related.
223) 
The linear equation for line (1) on the above graph is:
The linear equation for line (1) on the above graph is:
A) y = 8 + 2x.
B) y = 8 +.5x.
C) x = 8 +.5y.
D) y = 8 - 2x.
224) 
The slope of line (2) on the above graph is:
The slope of line (2) on the above graph is:
A) 0
B) B..66.
C) C..75.
D) 1.50.
225) 
The linear equation for line (3) on the above graph is:
The linear equation for line (3) on the above graph is:
A) y = 24 - 1.5x.
B) y = 16 -.5x.