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gre math review phần 4

For more material and information, please visit Tai Lieu Du Hoc at www.tailieuduhoc.org 17. If 3 times Jane’s age, in years, is equal to 8 times Beth’s age, in years, and the difference between their ages is 15 years, how old are Jane and Beth? 18. In the coordinate system below, find the (a) (b) (c) (d) | For more material and information please visit Tai Lieu Du Hoc at www.tailieuduhoc.org 17. If 3 times Jane s age in years is equal to 8 times Beth s age in years and the difference between their ages is 15 years how old are Jane and Beth 18. In the coordinate system below find the a coordinates of point Q b perimeter of ẰPQR c area of ỒPQR d slope y-intercept and equation of the line passing through points P and R 19. In the xy-plane find the a slope and y-intercept of a graph with equation 2 y x 6 b equation of the straight line passing through the point 3 2 with y-intercept 1 c y-intercept of a straight line with slope 3 that passes through the point -2 1 d x-intercepts of the graphs in a b and c 33 For more material and information please visit Tai Lieu Du Hoc at www.tailieuduhoc.org ANSWERS TO ALGEBRA EXERCISES 1. a 37 5 - y2 or 185 - 37y2 . . 3x 2 9x2 b -4 or 47_ c 18 x 4 y or 18 xy 4y 2. a 2x2 6x 5 c x 4 b 14x 1 d 6x2 13x - 5 3. 49 4. 2 5. a n2 e -L- w b st 7 f d3 c r8 g x9 d 32a h 9x2y3 b5 6. a 7 d - 6 2 b -3 e -7 2 c -9 f 2 -4 8 3 7. a x 21 c x 1 y 3 y J3 b x 10 y 10 7 8. a x - 4 c x 4 3 b x -13 Q 14 z 9. x 4 y 4 34 For more material and information please visit Tai Lieu Du Hoc at www.tailieuduhoc.org 10. 83 11. 15 to 8 12. 220 13. 3 14. 800 at 10 2 200 at 8 15. 48 mph and 56 mph 16. 108 17. Beth is 9 Jane is 24. 18. a -2 0 b 13 V85 19. a slope -1 y-intercept 3 b y I 1 c 21 -6 30 d slope -7- y-intercept -7 30 y -7- X y or 7y 6X 30 c 7 7 d 6 -3 -7 .