Energy can best be described as
a. the substance that makes up objects.
b. the inherent ability of a region of space and the matter within it to do work.
c. the amount of matter in an object.
d. the change in frequency that happens when a wave source moves.

To solve this system of equations by elimination, what operation could be used to eliminate the y-variable and find the value of x? 6x + 5y = 2 4x + 2y = 8 a) subtract 2 times the second equation from 3 times the first equation b) subtract 3 times the second equation from 2 times the first equation c) subtract 5 times the second equation from 2 times the first equation d) subtract 2 times the second equation from 5 times the first equation