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Tatiana [17]
3 years ago
11

Use numbers and pictures to show why a row with 6 smiley faces has one more than a row with 5 smiley faces

Mathematics
2 answers:
Alik [6]3 years ago
6 0
111111 There are 6  55555 There are 5 


Vlad1618 [11]3 years ago
3 0
Because the number 6 is larger than the number 5
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4y-x=5+2y; 3x+7y=24 solve systen by using substitution
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4y - x = 5 + 2y ..... (1)
3x + 7y = 24    ..... (2)

by grouping like terms in (1)
4y - x = 5 + 2y
4y - 2y - x = 5
<span>-x + 2y = 5 </span>        ..... (1a)

by multiplying (1a) through by -3
(-3)(-x) + 2(-3)y = 5(-3)
3x  -  6y = -15  ..... (1b)

by subtracting 1a from 2
3x -3x + 7y - (-6y) = 24 - (-15)
                      13y = 39
           ⇒            y = 3

by substituting y=3 into (2)
    3x + 7(3) = 24 
              3x = 24 - 21
              3x = 3
        ⇒     x = 1


∴ solution to the system is x=1 when y = 3
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