What is the equation of a line that passes through the point (4, 2) and is perpendicular to the line whose equation is y=x3−1 ? enter your answer in the box. i just wanted to see if my answer was correct i put y=-3x+14

In this question, the line is perpendicular to the y=x3−1.
I will assume that the y=x3−1  is y=x/3−1 because x^3 wouldn't have a perpendicular line. In this case, the perpendicular line should have a function of y=-1/(1/3)x + C  
y=-3x+C 

If you put the coordinate of (4, 2) into the function, then it would be: 
y=-3x+C 
2= -3(4)+C
C= 2+12=14

The function would be y=-3x+14

the law of definite proportions states samples of a compound will always contain the same proportion of elements by mass. in other words, a given compound will always contain the same elements in the same proportions by mass.the law of multiple proportions states when two elements combine with each other to form more than one compound, then the weights of one element that combine with a fixed weight of the other are in a ratio of small whole numbers.