Parallel rules help draftsmen, surveyors, cartographers, architects, and navigators draw accurate parallel lines. The instrument comes in two main forms: two rectangular straight edges connected by ...

Divide both sides by 2 to give 𝑦 = 3𝑥 + 5. It is now clear that the two lines both have a gradient of 3 so are therefore parallel. Find the equation of the line parallel to 𝑦 = 4𝑥 + 3 ...