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Review Ch 6-7 KEY

# Review Ch 6-7 KEY - FIU:MGF1106QUIZ4 KEY...

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FIU:  MGF1106 QUIZ 4 KEY Sections 6.1, 6.3-4, 7.1-3 Show work on this test paper (at least the set-up)! 1. Solve by substitution:   - = - - = x y x y 3 2 6 2 3 1. _ {12, 21} ( 29 = - = - = - 1 2 3 2 3 2 24 3 y x y y ( 29 - = - - + = - - = - - 3 2 6 3 4 2 6 6 12 3 x x x x x 2. Solve by addition:  - = - = - x y x y 4 3 5 3 2 2 2. _ (-16, -23) __ - - = - = - = - - + = x y x y x y x y 2 3 4 3 5 8 6 1 0 3 2 2 9 6 6 ur uuur -x = 16  x = -16 3(-16) – 2y = -2 -48 + 2 = 2y -46 / 2 = y = -23 3. Mr. and Mrs. Thompson invested \$10,000, some in a CD that yielded 5% 3.  CD = __ \$3,600 __ simple interest and some in a mutual fund at 7% simple interest.  If the  income from both investments at the end of one year was \$628, how much  MF = _ \$6,400 _ was invested in each.  , , , , . . , , , , c m c m m m c m c m c c + = - + - = - = = + = + = + = = 10 000 5 5 50 000 2 12 800 6 400 05 07 628 5 7 62 800 6 400 10 000 3 600 4. Graph the inequality: 3x - 6y > -18 5. Graph:    3 5 2 4 x y x y ≥ - - - : y < 1 / 2 x + 3 ½ x – 2 ≤ y

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Review Ch 6-7 KEY - FIU:MGF1106QUIZ4 KEY...

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