3x + 5y = -1
2x - 5y = 16
Add the two equations: 5x = 15 or x = 3
Substitute for x in the first equation: 3*3 + 5y = -1
15 + 5y = -1
5y = -10 so y = -10/5 = -2
The solution is (x, y) = (3, -2)
The LCM of 2x5y and 4x3y2 is 4x5x3y2 = 60xy2.
It is any fraction where the denominator is a multiple of non-negative integer powers of 2 and 5. In other words, a fraction with a denominator of the form 2x5y where x and y are non-negative integers.