Please help me figure these out! Thanks!

Mathematics

1 answer:

yawa3891 [41]3 years ago

6 0

For number 18 is c hope it helps

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7x²+3y²-28x-12y=-19

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Complete the square for x and y.

7x^2 + 3y^2 - 28x - 12y = -19

7x^2 - 28x + 3y^2 - 12y = -19

7(x^2 - 4x) + 3(y^2 - 4y) = -19

7(x^2 - 4x + 4) + 3(y^2 - 4y + 4) = -19 + 28 + 12

7(x - 2)^2 + 3(y - 2)^2 = 21

$\dfrac{(x - 2)^2}{3} + \dfrac{(y - 2)^2}{7} = 1$

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5x2 would be 10 and 10-50x would be negative 40x and 40x + 125 would be 165x

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Johns goal is to have more then -7 dollars in his bank account by the end of the month.

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Step-by-step explanation:

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