For the first question.

the graph given is

the x-intercepts give the x-values for which y = 0

so for this graph, the x-intercepts are the x-values such that:

or in other words, where

so the solutions to the first question is simply the x-intercepts, which you can tell by looking on the graph

For the second question:

we want the solutions to

this is where

So draw the line , the x-values of the points of intersection are your solutions