help please

6. Find the r-intercept(s): 3x2 + 2y + 4zy - 12 = 0 (c) 4 (a) +VB (b) 6 None of these. 7. Write the general equation of the circle with center at (2, -3) and a radius of 7. (a) 12 + y? - 4x + by+6=0 (b) 12 + y2 + 4x -By+6=0 ( c ) 12 + y2 - 4x+ By - 36=0 (d) 12 + y2 + 4x - by-36=0 (e) None of these. 8. In which of the following equations is y a function of z? (a) By+ 2x -9=17 (b) 2x2 y + 1 = 4y (c) Both a and b (d) Neither a nor b 9. Find the domain of the function: y = (a) (-00, 00) (b) (-00, 0) (0, 00) (c) (-00, 0) (d) (0, 0o) (e) None of these. 10. Given f(x) = 12 - 3x + 4, find f(z + 2) - f(2). (a) 12 - 3x+4 (b) 2+ 1 (c) 12 + x-8 (d) 12 - 3x -4 (e) None of these. 11. Determine the interval(s) over which the function is increasing: y = 2x + 312 - 12x (a) (-00, -2)(1, 00) (b) (-00, 20)(-7, 00) (c) (- 2, 1) (d) (20, -7) (e) None of these