exam Maths Puzzle Numerical Ability

AT 7 a.m. the temperature was -15 degrees F. By 1 p.m. the temp. increased by 18 degrees F. What was the temp. at 1 p.m.?

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Result in slope intercept form, (0,5),m=-3/4.

The following equations have to be writen through each of the given pairs of points. They have to also be done in slope intercept f
X2+Y2=25
Is solving this problem considered a function?

How do I plot a graph using a smooth curve for this problem?

Ed