Do all lines have a yintercept Why or why not What kinds of

Do all lines have a y-intercept? Why or why not? What kinds of lines are not functions?

Solution

A,

No All lines does not have y-intercepts;

Reason for a vertical line x = 2, there will be no y-intercept, because this line will never cross y-axis.

B.

Only vertical lines are not functions.

Reason,

for a vertical line x = 2, the points on the line will be given by (2, y).

Since for this line each x have more than one value, it cannot be a function.