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

1 Answer
Mar 26, 2016

(8,4)

Explanation:

The slope m of the line passing through (x1,y1)=(3,7) and (x2,y2)=(4,7) is given by the formula:

m=y2y1x2x1=7643=11=1

So a line through (x0,y0)=(7,3) parallel to the first line will also have slope 1. Its equation can be written in point slope form as follows:

yy0=m(xx0)

That is:

y3=1(x7)

Which we can rearrange in slope intercept form as:

y=1x4

Putting x=8 we get: y=84=4

So the second line passes through (8,4)