Respuesta :
x+y=12
y=2x
That is your equation because the first one shows that x plus y equals 12. The second equation is correct because it shows that two times x equals your y.
Leaving your two numbers to be x=4 y=8
y=2x
That is your equation because the first one shows that x plus y equals 12. The second equation is correct because it shows that two times x equals your y.
Leaving your two numbers to be x=4 y=8
The numbers are x and y, and their sum is 12. The word "sum" indicates addition; you will add x and y.
There's your first equation: x + y = 12
The first number, x, is twice the second number, y. In other words, x times 2 is y.
There's your second equation: 2x = y
The system of equations is: x + y = 12; 2x = y
If you needed to solve the system, you would first plug 2x for y into x + y = 12 and solve for x:
x + y = 12
x + 2x = 12
3x = 12
x = 4
Then you'd plug 4 for x into either equation to solve for y:
x + y = 12
4 + y = 12
y = 8
The solution to the system is (4, 8).