I.P.:
Direct Variation
1. Which graph best represent direct variation?
.
B.
C.
D.
2. Which of the following graphs or tables indicates that x and y vary directly?
A.
B.
x
2
3
4
y
10
15
20
C.
D.
x
7
9
10
y
12
42
60
Tell whether each equation represents a direct variation. If so, identify the constant of variation.
3.
4.
5.
6. If y varies directly as x, and y = 30 and x = 20, what is the value of y when x is 50.
7. If y varies directly as x, and y = 52 and x = 4, what is the value of y when x is 6.
8. If y varies directly as x, and y = 25 and x = 100, what is the value of y when x is 60.
9. If y varies directly as x, and y = 70 and x = 21, what is the value of x when y is 30.
10. If y varies directly as x, and y = 45 and x = 135, identify the constant of variation and the value
of x when y is 180.
11. If y varies directly as x, and y = 142 and x = 568, identify the constant of variation and find x
when y is 80.
12. What is the value of m?
13. What is the value of x?