Question

A first number plus twice a second number is 9. Twice the first number plus the second totals 27. Find the numbers

Answer 1

create a a system of 2 equations: 2x + y = 27 and 2y + x = 9, with x being the first number and y being the second. solve for the two variables and you'll get the first number is 15 and the second is -3.