2 years ago

Make x the subject of this equation: 3x - 5 = y

Mathematics

1 answer:

irakobra [83]2 years ago

6 0

Answer:

Step-by-step explanation:

x+ y+5/3 hope this helps

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The ages of two brothers are in the ratio two to three, but in eight years, the ratio of their ages will be three to four. What

Darina [25.2K]

X = older brother
y = younger brother

Equation 1: x/y = 2/3 ⇒ x = 2y/3
Equation 2: x + 8/y + 8 = 3/4

$( \frac{2y}{3} + 8) / y +8 = \frac{3}{4}$
$(2y + 24)/3 = y + 8 = \frac{3}{4}$
$2y + 24 = 3 (y + 8) = \frac{3}{4}$
$2y + 24 = 3y + 24 = \frac{3}{4}$
$4 (2y + 24) = 3 (3y + 24)$
$8y + 96 = 9y + 72$
$y = 24$

The age of the older brother is 24.

$x = \frac{2y}{3} = \frac{2*24}{3}$
$x = \frac{48}{3}$
$x = 16$

The age of the youngest brother is 16.

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3 years ago

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Slav-nsk [51]

Answer:

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Step-by-step explanation:

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2 years ago

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2 years ago

The digits 1, 7, and 8 and 2 copies of the digit 5 are all arranged to form a 5-digit integer. How many different integers can b

viktelen [127]

Step-by-step explanation:

You have 5 digits.Youdonot say if duplication is allowed. I will assume not

For the first digit you have 5 choices. One of the 5 digits is gone.

You now have 4 digits to choose from. You pick one. Now you have but 3 left.

The total answer if 5*4*3*2*1 = 120

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3 years ago

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Ymorist [56]

Answer:

900

Step-by-step explanation:

set both options equal to each other so we know the intersection.

30000 + 20t = 21000 + 30t

now solve for t.

10t = 30000-21000

t = 90000/10

t = 900

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2 years ago