Six divided by 258 = 0.023255814
258 divided by six = 43
6 square root of 258 = 96.37427043
258 square root of 6 = 631.9683536
Hope this helps!
The equation:

has the form:
y = mx + b
with

m is known as the slope of the line, then the slope is -2/3
The cube root of -64 is -4.
-4 times -4 equals 16. 16 times -4 would give you -64.