What is the slope of the line 7x - 2y = 18?

Solve for $y$: from $7x - 2y = 18$, subtract $7x$ to get $-2y = -7x + 18$, then divide by $-2$: $y = \frac{7}{2}x - 9$. The slope is $\frac{7}{2}$, choice C. The shortcut for $Ax + By = C$ is slope $= -\frac{A}{B} = -\frac{7}{-2} = \frac{7}{2}$. Choice A ($-\frac{7}{2}$) forgets that dividing by $-2$ flips every sign. Choice B ($\frac{2}{7}$) inverts the fraction. Choice D (18) is the constant on the right side, which relates to the intercept, not the slope.