To divide two fractions, you multiply the first fraction by the reciprocal of the second fraction.
Given the expression:
\[ -\frac{5}{8} \div -\frac{2}{3} \]
First, take the reciprocal of \(-\frac{2}{3}\), which is \(-\frac{3}{2}\). So, the division becomes:
\[ -\frac{5}{8} \times -\frac{3}{2} \]
Now, multiply the numerators and the denominators:
Numerator: \(-5 \times -3 = 15\)
Denominator: \(8 \times 2 = 16\)
Thus, we have:
\[ \frac{15}{16} \]
So, the quotient of \(-\frac{5}{8} \div -\frac{2}{3}\) is \(\frac{15}{16}\).