X1 2 3 4 5
y 4 7 10 13 16
given the table, write an equation for the function, and describe what it does. a) y=2x. y is double x b) y=3x. y is triple x. c) y=3x + 1. y is three times x plus 1. d) y=3x - 1. y is three times x minus 1.