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Is this relation a function?.

Point a is located at (0, 4), and point c is located at (−3, 5). find the x value for the point b that is located one fourth the distance from point a to point c. −0.25 −0.5 −0.75 −1

How do businesses a country's economy? a. by investing in goods and services b. by increasing the unemployment rate c. by making profits

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?