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bixtya [17]
3 years ago
12

A direct variation includes the points (21,7) and (27,Y. Findvalue of y.​

Mathematics
1 answer:
rjkz [21]3 years ago
3 0

Answer:

13

Step-by-step explanation:

5 has been added by the 21 to make 27 to leave with adding 5 to old y and leaving the new variable y 13

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ANSWER

The vertex of this parabola is (-7,4)

EXPLANATION

The given parabola has equation:

{y}^{2}  - 4x - 8y - 12 = 0

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Complete the square for the quadratic equation in y.

{y}^{2}  - 8y +  {( - 4)}^{2}  = 4x + 12 +  {( - 4)}^{2}

{y}^{2}  - 8y +  {( - 4)}^{2}  = 4x + 12 +  16

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{( y- 4)}^{2}  = 4(x +7)

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