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57
direct variation: y = kx y = kx k = y/x = 0.8/0.4 = 2
y=k*x 535=k*140 k=535/140=107/28 y=(107/28)*x
What is y? Fx varies with x, but y could be anything.
Y=kx+m Y=-5x+m K=-5
Find an equation of variation where y varies directly as x. One pair of values is y = 80 when x = 40
4x= y
y = 10x
40
57
y = 8
y = -5
direct variation: y = kx y = kx k = y/x = 0.8/0.4 = 2
y = kx: 10 = 37k so k = 10/37 and y = 10x/37
y = 3x y = 3*19 = 57
find the direct variation equation 3x+y=0
y = 3x because when x is 2.25 y is 6.75 a ratio of 1 to 3 and so when x is 4.2 y is 12.6