exam Maths Puzzle Numerical Ability

Help please: Determine algebraically whether the lines are parallel, perpendicular or neither. State the number of solution.

x - y = 5
x = 5 - y

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Can someone help me on this?

I need to graph the solution set of x > -7.
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Thanks, Lyn In a family there are two cars. In a given week, the first car gets an average of 20 miles per gallon, and the second car gets 40 miles per gallon. The two cars combined drive a to