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f(x) = x2 This is a function by the vertical line test because a vertical line drawn through this function will only intersect the function at one point
A line is a function ifany line parallel to the y axis meets the line at most once andall points where it does not meet the line are excluded from the domain.
Horizonatal line test is a test use to determine if a function is one-to-one. If a horizontal line intersects a function's graph more than once, then the function is not one-to-one. A one-to-one function is a function where every element of the range correspons to exactly one element of the domain. Vertical line test is a test used to determine if a function is a function or relation. If you can put a vertical line through graph and it only hits the graph once, then it is a function. If it hits more than once, then it is a relation.
A linear function
Yes, the resulting function is a straight line. This is the source:http://www.mathbench.umd.edu/mod207_scaling/page10.htm