3 years ago

3.8(6.5r -7.4) = 45.9

Mathematics

1 answer:

tino4ka555 [31]3 years ago

6 0

Step-by-step explanation:

6.5r - 7.4= 12.1

6.5r = 19.5

r = 3

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X + y = 152,<br><br> 8.5x + 12y = 1,656<br><br> How many hats were sold?

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Answer:

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Step-by-step explanation:

Given equations are:

$x+y = 152\\8.5x+12y=1656$

From equation 1:

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Putting the value of y in equation 2

$8.5(152-y)+12y = 1656\\1292-8.5y+12y = 1656\\3.5y+1292 = 1656\\3.5y = 1656-1292\\3.5y = 364\\\frac{3.5y}{3.5} = \frac{364}{3.5}\\y = 104$

Now we have to put the value of y in one of the equation to find the value of x

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$x+y = 152\\x+ 104 = 152\\x = 152-104\\x = 48$

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The solution of the system of equations is x = 48 and y = 104

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