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wel
3 years ago
9

There are 6 times as many dogs as cats. If total the total number of dogs and cats is 21, how many dogs are there?

Mathematics
1 answer:
artcher [175]3 years ago
3 0

there are 18 dogs and 3 cats.

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PB_WITH_FSA_DIAG_6825_OL_FY21
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x=-1/2

Step-by-step explanation:

\frac{5x-2}{3x+1}=9\\\\\frac{5x-2}{3x+1}*(3x+1)=9*(3x+1)\\\\5x-2=9(3x+1)\\\\5x-2=9(3x)+9(1)\\\\5x-2=27x+9\\\\5x-2-9=27x+9-9\\\\5x-11=27x\\\\5x-5x-11=27x-5x\\\\0-11=22x\\\\-11=22x\\\\-11=11(2x)\\\\-11*(\frac{1}{11})=\frac{11(2x)}{11}\\\\-1=2x\\\\x=-\frac{1}{2}

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7 0
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the length of a rectangle with area 54 square centimeters is 9 centimeters. what is the perimeter of the rectangle, in centimete
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