how to find out y intercept on a graph and slope of the graph

the y-intercept is here the graph crosses the y-axis.

For the slope, see how much y changes when x changes by +1. That is the slope of the line.

For example if y=4 when x=2, and y=7 when x=3, then y has changed by +3 when x changed by +1. The slope is +3.