Exploring m and c in the gradient intercept form of a straight line
1. General Equation: y = mx+ c 60
50
m c 40
-8 11 30
20
Equation: y = -8 x+ 11 10
0
Press "F9" to generate coordinates of
12
-5
31
0 5 -10
any 2 points on the line.
51 11 -29
-20
when x1 = -3 y1 = 35 -30
when x2 = -3 y2 = 35
-40
-6 -4 -2 0 2 4 6
m=
35 - 35
Hint : m=
y2 - y1
-3 - -3 x2 - x1
What happens to "m" when the
= #DIV/0! pairs of coordinates change?
Filename: exploringmandcinthegradient-interceptformofastraightline-101006004553-phpapp02.xls Date Printed: 10/06/2010
Tab: Linear Graph Time Printed: 05:46:00
