I'll help with the first. So we have the equations:
To find the point of intersection with algebra, we just solve the system for x and y.
So let's substitute the value of y in (I) into (II):
Now substitute our value of x into (I):
For the x value of 4:..
So we have the point:..
For the x value of -3, substituting it into (I), we get -4.
So we also have the other point
The graph agrees with my answer: