Math
posted by paula on .
if the line containing the points (a,3) and (b,2) has a slope of 1/7, then ab=

Slope :
m = ( y2  y1 ) / ( x2  x1 )
In this case :
x1 = a
x2 = b
y1 = 3
y2 = 2
m = ( y2  y1 ) / ( x2  x1 ) = 1 / 7
( 2  3 ) / ( b  a ) = 1 / 7
 1 / ( b  a ) = 1 / 7
Reciprocal value :
 ( b  a ) = 7
 b + a = 7
a  b = 7