1)Look at diagram below.

2)Look at the first line. Let be the angle is forms. Then . Thus, .

The radius of this is, .

Therefore, expressed in polar form is,

Look at the second line. Let be the angle it forms (acute). Then, . Thus, . The radius of this is, . Therefore, expressed in polar form is,

Note the minus because we need it to give a minus in front of sine because the point is below x-axis.