Direct Variation

The letter k in the equation y = kx stands for

• the constant of proportionality

• king

• queen

Do x and y show direct variation?

y = 5x

• Yes

• No

The graph of a direct variation must be a straight line and must pass though

• Quadrant 1 and 3

• Quadrant 2 and 4

• the origin (0,0)

Does this table of values represent a direct variation?

• Yes

• No

Y varies directly as x. If y = 12 when x = 15, what is y when x = 20?

• 4/5

• 17

• 16

• 25

n varies directly with c. If c = 24 when n = 18, what is c when n = 22?

• 88/3

• 28

• 66/4

• 24

An equation of direct variation can be written in the form: y = kx

• True

• False

Do x and y show direct variation?

y = 2x + 3

• Yes

• No

Is this the graph of a direct variation?

• Yes

• No

Is this the graph of a direct variation?

• Yes

• No