A line passes through #(4 ,9 )# and #(1 ,7 )#. A second line passes through #(3 ,6 )#. What is one other point that the second line may pass through if it is parallel to the first line?

1 Answer
Mar 23, 2016

the slope of our first line is the ratio of change in y to change in x between the two given points of (4, 9) and (1, 7).
#m=2/3#
our second line will have the same slope because it is to be parallel to the first line.

our second line will have the form #y=2/3 x + b# where it passes through the given point (3, 6). Substitute x = 3 and y = 6 into the equation so that you can solve for the 'b' value.

you should obtain the equation of the 2nd line as:
#y=2/3 x + 4#

there are an infinite number of points you could select from that line not including the given point (3, 6) but the y intercept would be a very convenient one since it is the point (0, 4) and can be readily determined from the equation.