Chapter 4 - Writing Linear Functions - 4.3 - Writing Equations of Parallel and Perpendicular Lines - Exercises - Page 192: 31

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Compute the slope of first line: $$m_1=\frac{8-16}{0-(-4)}=\frac{-8}{4}=-2$$ Compute the slope of second line: $$m_2=\frac{8-0}{0-(-4)}=\frac{8}{4}=2$$ Check if the product is $-1$: $$2\cdot(-2)=-4$$ Since it is not $-1$, then they do not make right angle.