What is the y-intercept of the line 3x - 5y = 20?

The $y$-intercept occurs where $x = 0$. Substitute: $3(0) - 5y = 20$, so $-5y = 20$ and $y = -4$, choice B. Alternatively, solve for $y$: $-5y = -3x + 20$, so $y = \frac{3}{5}x - 4$, and the constant term is the intercept. Choice A (20) is the constant on the right side, not the intercept. Choice C (3) is the coefficient of $x$. Choice D (4) has the right size but the wrong sign, from forgetting to divide by the negative coefficient $-5$. Watch signs when dividing by a negative number.