Please answer quickly in those 3 question if u know one of those answer than answer it if u don't than its fine

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11-03-2015
Mathematics

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Please answer quickly in those 3 question if u know one of those answer than answer it if u don't than its fine

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sugarmate sugarmate · Answer 1 · 2015-03-11T18:15:01+01:00

sugarmate sugarmate

11-03-2015

lst question: x = 5, y = 7

2nd question: x = -1, y = 5

3rd question: x = 98, y = 80

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Panoyin Panoyin · Answer 2 · 2015-03-12T02:43:54+01:00

1. 1x +   1y = 12 ⇒ 14x + 14y = 168
    14x + 10y = 140 ⇒ 14x + 10y = 140
   4y = 28
          4 4
   y = 7
   14x + 10(7) = 140
             14x + 70 = 140
          -70 -70
   14x = 70
      14    14
   x = 5
   (x, y) = (5, 7)
      A. five adults and 7 children

2. x + y = 4
    x - y = -6
   2x = -2
      2 2
   x = -1
-1 + y = 4
+1 +1
      y = 5
(x, y) = (-1,5)
C. (-1,5)

3. x + y = 178 ⇒ 0.1x +   0.1y = 17.8
0.1x + 0.25y = 29.8 ⇒ 0.1x + 0.25y = 29.8
      -0.15y = -12
   -0.15 -0.15
      y = 80
      0.1x + 0.25(80) = 29.8
   0.1x + 20 = 29.8
   -20   -20
      0.1x = 9.8
       0.1    0.1
   x = 98
   (x, y) = (98, 80)
   D. 98 dimes and 80 quarters