book Maths Puzzle Numerical Ability

If the equationof a line isy=1/3x+2then
a.Give an exampleof an equation of another parallel to this one.
b. Give an example of a line perpendicular to this one.

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book Other Question

On a trip Jennifer noticed that her car averaged 21 mi/gal of gas except for the days she used the air conditioning, and then it averaged only 17 mi/gal. If she used 91 gal of gas _
For the equation x - Ö</font>x = 0, perform the following:
Solve for all values of x that satisfies the equation.</PRE>