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Ivenika [448]
3 years ago
11

When x is 3, y is 15. If y varies directly as x, which equation relates x and y?

Mathematics
1 answer:
NARA [144]3 years ago
4 0

Answer:

x5=y

Step-by-step explanation:

Let's say 3y=15

3 x 5 = 15, so y=5.

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Answer:

67°

Step-by-step explanation:

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hence ∠aed = ∠acb = 39

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x = 67°

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3 years ago
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Step-by-step explanation:

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B(n)=4−6(n−1) Find the 4th term in the sequence.
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3 years ago
A and B are postive integers such that 1/a + 1/b +1/ab = 1. Find ab
Kitty [74]

Answer: ab =6

have:

\frac{1}{a}+\frac{1}{b}+\frac{1}{ab}=1\\\\=>\frac{b}{ab}+\frac{a}{ab}+\frac{1}{ab}=1\\\\\frac{a+b+1}{ab}=1

=> a + b + 1 = ab

⇔ a + b + 1 - ab = 0

⇔ b - 1 - a(b - 1) + 2 = 0

⇔ (b - 1)(1 - a) = -2

because a and b are postive integers => (b - 1) and (1 - a) also are integers

=> (b - 1) ∈ {-1; 1; 2; -2;}

(1 -a) ∈  {-1; 1; 2; -2;}

because (b -1).(1-a) = -2 => we have the table:

b - 1        -1             1              2             -2

1 - a         2            -2            -1              1

a              -1            3             2              0

b              0            2             3              -1

a.b            0           6             6               0

because a and b  are postive integers

=> (a;b) = (3;2) or (a;b) = (2;3)

=> ab = 6

Step-by-step explanation:

4 0
3 years ago
Write the sum of 8x^2 - x + 4 and x - 5<br><br> Show all work
tigry1 [53]

okey

you needed the sum or division?

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2 years ago
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