y = 7.5, the way I was taught to find this is to put 4 over 10 and 3 over x so it would look like this: 4/10=3/x Then you cross multiply. First multiply 10 and 3 and put 4 and x together like this: 30=4x Then to figure out x you divide 4 from both to get 7.5
Sorry if the explanation was confusing
