Question 996513: the sum of two number is 21.five times the first is added to 2 times the second number is 66.find the two number Answer by fractalier(6550) (Show Source):
You can put this solution on YOUR website! Call them x and y. Thus
x + y = 21 and then
5x + 2y = 66
Multiply the top equation by two and subtract from the bottom one...
5x + 2y = 66
-(2x + 2y = 42)
and we get
3x = 24
x = 8
y = 21-x = 13
