<PRE><B>Question 396112</B>
A=(3,7),(-1,2)
a) SLOPE=(Y2-Y1)/(X2-X1)
SLOPE=(2-7)/(-1-3)
SLOPE=-5/-4=5/4=1.25 ANS.
B) Y=mX+b
7=1.25*3+b
7=3.75+b
b=7-3.75
b=3.25 
Y=1.5X+3.25 ans.
C) {{{ graph( 300, 200, -6, 5, -10, 10, 1.5x +3.25) }}} (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, of TWO functions 1.5x +3.25). </PRE>