If 5y + 2x = 25 and x=y−1, what is the value of y

5y + 2(y-1) = 25
5y + 2y - 2 = 25
5y + 2y = 27
7y = 27
y = 27/7 or about 3.857

One shot. if 60% of 10 is 6, then what is 70%? we know it would be seven (since 60% is mathematically 60/100, or 6/10, then 70% is 70/100, or 7/10) but we can check anyway using ratios: 6 : 60% = x : 70%*inverse multiplicationx * 60% = 6 * 70%*divide both sides by 60%x = (6 * 70%) / 60%x = 7and since he has made 6 shots already, he would need just one more to get 7 shots or 70%. if the explanation is too confusing, comment and i will try to