Evaluate the expression 5x-y when x=2 and y=4

Mathematics

1 answer:

mariarad [96]3 years ago

5 0

Answer:

Step-by-step explanation:

5 times 2 (×) 10- 4(y)

when a varbile (letter) is besides then you multiply

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2n+3pm=7px solve for x

anygoal [31]

Answer:

Hello!

Step-by-step explanation:

Let's solve for x.

Step 1: Flip the equation.

Step 2: Divide both sides by 7p.

Finally, you get:

x=3mp+2n/7p

I've also added an attachment of the answer as well!

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2 years ago

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2 years ago

3 sinx + 4 cosx = 5

vagabundo [1.1K]

<span>3sinx+4cosx=5
=> 3/5 sinx +4/5 cosx = 1
let cosA=3/5 => sinA=4/5
=> cosAsinx + sinAcosx = 1
=> sin(x+A) = 1
Now,
4sinx - 3cosx
= 5(4/5sinx - 3/5 cosx) [multipying numerator and denominator by 5]
= 5(sinAsinx - cosAcosx)
= -5{cos(x+A)} = -5[root{1-(sin(x+A)^2)}] = -5 x 0 = 0 Ans 0

TRICK: if asinx+bcosx is given then multiply numerator and denominator by root(a^2 +b^2)
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3 years ago

laura has a mass of 60kg and is sitiing 265cm from the fulcrum of a seesaw. bill has a mass of 50kg. how far from the fulcrum mu

pickupchik [31]

Answer:

318 cm.

Step-by-step explanation:

Let x represent the distance between Bill and fulcrum.

We have been given that Laura has a mass of 60 kg and is sitting 265 cm from the fulcrum of a seesaw. Bill has a mass of 50 kg.

To balance the seesaw, the product of Laura's weight and her distance from fulcrum of seesaw should be equal to the product of Bill's weight and his distance from fulcrum of seesaw as:

$50\text{ kg}\cdot x=60\text{ kg}\cdot 265\text{ cm}$