Question

If x-2y=0 and 3x+y=7 whats the vaule of ×?

Answer 1

The first equation may be written

x = 2y

The second equation is

3x + y = 7

Substituting

3(2y) + y = 7

6y + y = 7

7y = 7

y = 1

x = 2y = 2

Answer: 2