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mash [69]
3 years ago
12

Y=3x+8 12x−4y=−32 ​ How many solutions does this system have?

Mathematics
1 answer:
Gnoma [55]3 years ago
5 0
-3x+y = 8
12x-4y = -32

(-3x+y = 8) 4
12x-4y = -32

-12x+4y = 32
12x-4y = -32

0=0

Infinitely many solutions.
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A rectangular auditorium seats 1564 people. the number of seats in each row exceeds the number of rows by 1212. find the number
yanalaym [24]
<span>We can safely assume that 1212 is a misprint and the number of seats in a row exceeds the number of rows by 12. Let r = # of rows and s = # of seats in a row. Then, the total # of seats is T = r x s = r x ( r + 12), since s is 12 more than the # of rows. Then r x (r + 12) = 1564 or r**2 + 12*r - 1564 = 0, which is a quadratic equation. The general solution of a quadratic equation is: x = (-b +or- square-root( b**2 - 4ac))/2a In our case, a = 1, b = +12 and c = -1564, so x = (-12 +or- square-root( 12*12 - 4*1*(-1564) ) ) / 2*1 = (-12 +or- square-root( 144 + 6256 ) ) / 2 = (-12 +or- square-root( 6400 ) ) / 2 = (-12 +or- 80) / 2 = 34 or - 46 We ignore -46 since negative rows are not possible, and have: rows = 34 and seats per row = 34 + 12 = 46 as a check 34 x 46 = 1564 = total seats</span>
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erik [133]

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Stolb23 [73]

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Read 2 more answers
HELP DUE 8:30 will give brainliest
MariettaO [177]

The roots of the parabola is where the x-intercepts are so the answer is x=-1 and x= 5

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8 1/2 = 8 4/8, so…
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Final answer is…
6 1/8
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