Given the table, write an expression for the function, and describe what it does. A) y=2x. y is double x.
B) y=3x. y is triple x.
C) y=2x + 1. y is twice x plus 1.
D) y=2x - 1. y is twice x minus 1.

x 1 2 3 4 5
y 3 5 7 9 11

First locate the turning point (vertex) of the graph. which is at the coordinates x=5 and y=9 or (5; 9).to determine whether it's a maximum or mininum value, you have to discern whether the vertex's y-value is the highest value or lowest value the graph can reach. since the vertex's y-value, 9 is the highest value the graph can reach, it will be a maximum.another basic way to determine whether the vertex's value is max or min is to see if the graph is smiling or sad. if it's smiling, the turning point/vertex would be a minimum, while a sad parabola would have a maximum y-value at the vertex.

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