Final answer:
The result is 16/45.
Step-by-step explanation:
To evaluate the expression -4/5, we substitute the given values of x and y. Since x is -2/3 and y is -1 7/8, we can rewrite the expression as -4/5 = (-2/3) / (-1 7/8). To divide fractions, we multiply by the reciprocal of the divisor, so -4/5 = (-2/3) * (-8/15). Multiplying the numerators and the denominators gives us -4/5 = 16/45.
Therefore, the value of -4/5 when x is -2/3 and y is -1 7/8 is 16/45.