A function should produce one output for one given input.
Therefore a function should pass the vertical line test.
From the figure,
a,b,c pass the vertical line test;
d fails the vertical line test.
Answer: Case d does not represent a function.
Therefore a function should pass the vertical line test.
From the figure,
a,b,c pass the vertical line test;
d fails the vertical line test.
Answer: Case d does not represent a function.