Question 362321
Find a real number, n, such that the line containing
the points (-5, 5) and (-1, 9) 
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slope = (9-5)/(-1--5) = 4/4 = 1
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Form: y = mx + b
5 = 1(-5)+b
b = 10
Equation of line thru (-5,5) and (-1,9):
y = x + 10
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contains the point (n, 5).
Substitute n for x and 5 for y; then solve for "n":
5 = n + 10
n = -5
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Cheers,
Stan H.
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