In the figure,L1:x+2y-7=0 cut the x-axis at A.The x-intercept of another lineL
2 is -3. Supposed L'1 Is perpendicular with L2 and they intersect at P.
a)Find the equation of L2.
b)find the coordinates of A and P
c)Find the area of the shaded region.

作業要自己寫 ^^;;;