Question

A number minus two times another number is 4. three times the first number plus two times the second number is 12. set up the system of equations to find the numbers.

Answer 1

x-2y = 4
3x+2y = 12
So, x = 4+2y
3(4+2y) + 2y -> 12 + 8y, so y = 0
x-2(0)= 4, so x=4

Answer 2

x= first number y= second number

x-2y=4

3x+2y=12