January 26, 2017
HW: Direct Variation/2, 4, 6, 7, 9
Warm up:
Graph
1) f(x) = 2x2 - 8x + 3
2) g(x) = 7 - 3x2
January 26, 2017
A direct variation is a function defined by an
equation of the form:
y = kx
Where k is a non-zero constant
"y varies directly as x"
January 26, 2017
What does the graph of a direct variation
function look like?
What is the constant of variation?
January 26, 2017
t varies directly as s and t = 16 when s = 2.
Write an equation to find the constant of
variation. Then find y when x=5.
January 26, 2017
y varies directly as x and y = 12 when x = 2.
Write an equation to find the constant of
variation. Then find x when y = 7.
January 26, 2017
January 26, 2017
Directly Proportional
An employee's wages are directly proportional to
the time worked. If an employee earns $100 for
5h, how much will they earn for 18h?
January 26, 2017
HW Solutions
January 26, 2017
January 26, 2017
January 26, 2017
January 26, 2017
January 26, 2017
January 26, 2017
January 26, 2017
January 26, 2017
January 26, 2017
Math Journal
January 26, 2017
Determine if 1)
each line is an
example of
direct variation.
pg. 395/3, 5
2)