If a and B satisfy 3 √ a + 5 | B | = 7, what is the value range of S = 2 √ A-3 | B |? In a hurry···

If a and B satisfy 3 √ a + 5 | B | = 7, what is the value range of S = 2 √ A-3 | B |? In a hurry···

Let x = √ a, y = B, then x > = 0, Y > = 0
By substituting 3x + 5Y = 7, y = (7-3x) / 5 into s, we get
S=2X-3Y=2X-(21-9X)/5=19X/5-21/5
Because y = (7-3x) / 5 > = 0, X