Translate this word problem as a system of equations and then solve using substitution. The sum of two numbers is 84. One number is three times the other. Find the numbers.
let us set the the two numbers as: x and y, so we have,
x + y=84, so x=84 - y
x=3y, we substitute,
84 - y=3y
84=4y
y=84/4
y=21 and x=21 X 3=63
