Hello, simplekin!

You're almost there . . .

Two perpendicular lines intersect on the x-axis.

One line has equation:

What is the equation of the other line?

This is what i got to so far:

Slope of -1/2 reciprocated is just 2 . . . so we got: y = 2x + b

Then this is where i don't know where to go.

The line, has an x-intercept of 2.

. . Hence, the two lines intersect at (2,0).

You found that the other line has a slope of 2.

Can you write the equation of the line through (2,0) with slope 2 ?