How many tiles in figure 0? where is the y intercept?

Ahemmm   how many tiles or rectangles in the grid?   well, notice, each quadrant is a 9x11 rectangles, so there are 9*11 rectangles in each quadrant, there are 4 quadrants, thus 4 * 9 * 11 rectangles in the grid.

where's the y-intercept?  well, just look at the line, what are coordinates where the graph touches or intercepts the y-axis?   well, is at (0,3).

Did u want to find the value of x?