If 3x + 2y = 7 and 4x - y = 24, then x - y = ______.
1). 9
2). 1
3). -9
4). -1
2. If 225x + 14175y + 625z = 25 and 8x + 792y + 72z = 800 then find the value of 10x + 666y + 34z.
4. If 7x - [3(2x - 3)]/2 = 1/2, then what is the value of x?
6. If (x2 – x + 1)/(x2 + x + 1) = 3, then the value of x + 1/x is:
9. If a + b = 8 and ab = 15, then what is the value of a3 + b3?