Subtracting a negative number from a negative number – a minus sign followed by a negative sign, turns the two signs into a plus sign. So, instead of subtracting a negative, you are adding a positive. Basically, - (-4) becomes +4, and then you add the numbers. For example, say we have the problem -2 - –4.
Y = k / x² ( y varies inversely as the square of x ) y = 1/8 when x = 1: 1/8 = k / 1² 8 k = 1 k = 1/8 For x = 5: y = 1/8 / 5² = 1/8 : 25 = 1/8 · 1/25 = 1/200 Answer: A ) 1/200