(i) 45

^{0}(ii) 30^{0}(iii) 90^{0}
(i) 45

^{0}
Solution:

The slope of line = tan θ

∴ The slope of the line = tan 45

^{0}= 1
∴ The slope of the line is 1.

(ii) 30

^{0}
Solution:

The slope of line = tan θ

(iii) 90

^{0}
Solution:

Solution:

The slope of line = tan θ

∴ The slope of the line = tan 90

^{0}= Not Defined
∴ The slope of the line is Not Defined.