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2 years ago

X + 9y = 8 x − 4y = –18

Mathematics

1 answer:

loris [4]2 years ago

5 0

Step-by-step explanation:

$x + 9y = - 18 \\ 8x - 4y = - 18 \\ x = - 18 - 9y \\ 8( - 18 - 9y) - 4y = - 18 \\ - 144 - 72y - 4y = - 18 \\ - 76y = 126 \\ y = - 1.66 \\$

$x = - 18 - 9y \\ x = - 18 - 9( - 1.66) \\ x = - 18 + 14.94 \\ x = - 3.06$

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Step-by-step explanation:

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Two quantities x and y are said to proportional to each other

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Here, k is called the PROPORTIONALITY CONSTANT.

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Now, for the given quantities:

a. $18.36 for 3 pizzas [box]

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b. $4.17 for 3 pounds of bananas [box]

Here, $k = \frac{x}{y} = \frac{4.17}{3} = 1.39$

So, the proportionality constant is 1.39.

c. $16.48 for 4 pounds of potatoes [box]

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So, the proportionality constant is 4.12.

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3 years ago

Read 2 more answers