Type the following equations into the graph entry box and see if they pass the vertical line test. If the vertical line only passes through 1 point on the graph at a time, then it is a function. If the vertical line ever passes through more than one point at a time then the graph is not a function.[br]a. [math]y^2+x^2=9[/math][br]b. [math]y^2-2x=4[/math][br]c. [math]y=x^2-2[/math][br]d. [math]y=\frac{1}{3}x+1[/math][br]e. [math]y=2^x-3[/math][br]f. [math]y=2x^3[/math][br][br]