The slope of a line is given by the formula $\frac{y_2 - y_1}{x_2 - x_1}$.
For AB, we have $A(1,1)$ and $B(7,4)$. So, the slope of AB is $\frac{4 - 1}{7 - 1} = \frac{1}{2}$.
For DC, we have $D(-1,7)$ and $C(5,10)$. So, the slope of DC is $\frac{10 - 7}{5 - (-1)} =
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