What is the y-intercept

The y -intercept of a graph is the point where the graph crosses the y -axis. (Because a function must pass the vertical line test , a function can have at most one y -intercept . ) The y -intercept is often referred to with just the y -value.

Step-by-step explanation:

see attached picture

Step-by-step explanation:

From the question we are told that:

Seventh term

Common difference

Generally Equation for seventh term

Therefore the  First Term is given as

Generally the equation for 9th term is mathematically given by