Contrapositive is ''If a line has not slope equal to zero, then it is not horizontal''
The given conditional statement is "If a line is horizontal, then it has slope equal to zero”.
Take statement [tex]\mathbf{p}[/tex] as ''a line is horizontal'' and statement [tex]\mathbf{q}[/tex] as ''it has slope equal to zero''
For a conditional statement of the form [tex]\mathbf{p}\rightarrow \mathbf{q}[/tex], contrapositive is given by [tex]\sim \mathbf{q}\rightarrow \sim \mathbf{p}[/tex]
So, the contrapositive of the given statement is as follows:
''If a line has not slope equal to zero, then it is not horizontal''
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