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MA_775_DIABLO [31]
3 years ago
12

Substiution method: y + 9 = 1/5x and

Mathematics
1 answer:
uranmaximum [27]3 years ago
4 0
Y+9=1/5x menjadi y= 1/5x -9
sesudah ini sibtusika n dalam persamaan 4x - 5y = -15x
<span>                                                             4x -5(1/5x-9)= -15 x
                                                             4x + x+45=-15x
                                                             5x +45 = -15x                                                                                                            45=-20x 
                                                              x=-45/20
                                                              x= -9/4
 
 y+9 =1/5x
   y      = 1/5(-9/4)-9
      y     = -189/20
  (-</span>9/4,-189/20)
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Step-by-step explanation:

Let x represent the amount invested in the account earning 5% interest.

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The formula for simple interest is expressed as

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Assuming the duration for both investments is 1 year,

The interest on the first account would be

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The interest on the second account would be

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George earned a total of $342 in simple interest from two separate accounts. This means that

0.05x + 0.02y = 342 - - - - - - - - - - 1

Substituting x = 2y + 1800 into equation 1, it becomes

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0.1y + 0.02y = 342 - 90

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4 0
3 years ago
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