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DanielleElmas [232]
3 years ago
5

If y=-7when x=-21,what is the value of x when y=9

Mathematics
1 answer:
Bond [772]3 years ago
5 0

Answer:

27

Step-by-step explanation:

-21/-7 =3 so x is 3y. if you plug 9 in for y you get 3(9) then you multiply and get 27.

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2 years ago
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Vera_Pavlovna [14]

Answer:

50

Step-by-step explanation:

When a number is next to a variable, such as 5x, this means you will multiply them(five times x). With x being -2, we will multiply -2 x -2 = 4. the exponent tells you how many times to multiply a number by itself. If the exponent was 5, we would multiply 2 by itself 5 times to get 10. Since we got 4 for our answer, we will multiply that by since it was an exponent and we multiply it. 4 x 5 = 20. Since we know that we multiply numbers next to variables, we will multiply 3y or 3(10). 3 x 10 = 30. Add this to 20 to get your answer. 20 + 30 = 50.

Hope this helps :)

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