You can't. You need 2 equations to solve for 2 unknowns
7
4
2y = 4 (divide both sides by 2 to solve) y = 2
78
the answer is 4
2 is
Elementary - 2012 Solve for X 2-2 is rated/received certificates of: USA:TV-14
turn on the game and solve it yourself
You cannot solve it since it is not a true equation.
2
2:1 is reciprocal of 1:2