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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

Please Answer Quickly In Those 3 Question If U Know One Of Those Answer Than Answer It If U Dont Than Its Fine class=
Please Answer Quickly In Those 3 Question If U Know One Of Those Answer Than Answer It If U Dont Than Its Fine class=
Please Answer Quickly In Those 3 Question If U Know One Of Those Answer Than Answer It If U Dont Than Its Fine class=

Sagot :

sugarmate
lst question:  x = 5, y = 7

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

3rd question: x = 98, y = 80
Panoyin
  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
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