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3 years ago

Given that 9 x − 4 y = 20 Find y when x = − 2 Give your answer as an improper fraction in its simplest form

Mathematics

1 answer:

never [62]3 years ago

6 0

Answer:

$\boxed{\df\ \dfrac{-19}{2}}$

Step-by-step explanation:

Hi,

x=-2

it gives

9*(-2)-4y=20

<=> -18-4y=20

<=> 18-18-4y=20+18=38

<=> -4y=38

<=> y = -38/4=-19/2

hope this helps

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Mia found the area of a polygon The area is 32 square cm.

solniwko [45]

Answer:

Only the isosceles trapezoid has an area of 32 cm².

Step-by-step explanation:

Let's calculate the area of each polygon.

For the two triangles we have:

$A_{t} = \frac{bh}{2} = \frac{2 cm*4 cm}{2} = 4 cm^{2}$

This polygon does not have an area of 32 cm².

For the rectangle we have:

$A_{r} = bh = 6 cm*4 cm = 24 cm^{2}$

This polygon does not have an area of 32 cm².

For the rectangle trapezoid we have:

$A_{rt} = A_{t} + A_{r} = (4 + 24) cm^{2} = 28 cm^{2}$

So, this polygon does not have an area of 32 cm².

Finally, for the isosceles trapezoid:

$A_{it} = A_{t}*2 + A_{r} = (4*2 + 24) cm^{2} = 32 cm^{2}$

This polygon does have an area of 32 cm².

Therefore, only the isosceles trapezoid has an area of 32 cm².

I hope it helps you!

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3 years ago

Solve 3x2 − x = 10

Crazy boy [7]

Option number 2 I think.

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3 years ago

The school store sells binders for $5 and notebooks for $4. The store needs to sell $80 worth of these two items combined each w

lorasvet [3.4K]

Answer:

Step-by-step explanation:

Step one:

given

let binders be x

and notebooks be y

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the cost of binder is $5 each

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step two:

the linear model for the total sales is given as

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using the given data, the situation can be represented linearly as

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Therefore the linear expression for the total sale is 80=5x+4y

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astraxan [27]

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frutty [35]

Answer:

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Step-by-step explanation:

In naming an angle using 3 letters the letter denoting the vertex is always located in the middle of the 3 letters

Thus ∠BAC and ∠CAB

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