ax + 5y = 8 has slope of $-\frac{4}{3}$. What is the value of a?

ax + 5y = 8 has slope of $-\frac{4}{3}$. What is the value of a?
1). $\frac{20}{3}$
2). $\frac{3}{20}$
3). $-\frac{20}{3}$
4). $-\frac{3}{20}$

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