y = kx?
Substitute the x and y value, then take the log of both sides.
log y = k*?*log x
can you show me how to do this with the points
Two points determine a line. Given two points (Q,W) and (E,R), you can find the equation of the unique line, y = m x + b that goes through those two points.
Three points determine a parabola, y = a x^2 + b x + c
Four points determine a cubic, y = a x^3 + b x^2 + c x + d
given (Q,W) and (E,R)
slope = m = (R-W)/(E-Q)
so now you have m
go back and put first point in to get b from b = y - m x = W - m Q
m = (80-5) / (6-2)
m = 75/4
b = 5 - (75/4)2
b = 5 - 75/2
b = (10-75)/2
b = -65/2
y = (75/4)x -65/2
4 y = 75 x - 130
I did not understand that your question related only to direct variation until I saw Dr. Bob's answer.
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