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3 years ago

If x=9, what is the value of your in the equation below? y=8x-(1+4x)

Mathematics

2 answers:

n200080 [17]3 years ago

8 0

Plug 9 in. This is what the equation would look like.
Y=8(9)-(1+4(9))
Y=72-(5(9))
Y=72-45
Y=27

Phantasy [73]3 years ago

5 0

Y=72-(1+36)
Y=72-37
Y=35

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The length of a rectangle is 3 inches more than the width. The area is 10 square inches. Find the dimensions

mr_godi [17]

Answer:

Width = 2

Length = 5

Step-by-step explanation:

let A be the area of the rectangle

L be the length of the rectangle

w be the width of the rectangle

Formula: ‘area of a rectangle’

A = L × w

…………………………………………………

A = L × w

⇔ 10 = (w + 3) × w

⇔ 10 = w² + 3w

⇔ w² + 3w - 10 = 0

Solving the quadratic equation w² + 3w - 10 = 0 :

Δ = 3² - 4(1)(-10) = 9 - (-40) = 9 + 40 = 49

then √Δ = 7

$\Longrightarrow w=\frac{-b+\sqrt{\Delta } }{2a} =\frac{-3+7}{2} =2$

$or\ w=\frac{-b-\sqrt{\Delta } }{2a} =\frac{-3-7}{2} =-5$

-5 is not valid ,because w represents the width

which must be a positive number

Then w = 2

Conclusion:

Width = 2

Length = 2 + 3 = 5

6 0

2 years ago

Kyle bought a sheet of lumber 8.7 feet long to build fence rails. He cut the strip into 3 equal pieces. How long is each piece?

forsale [732]

Answer:

i believe its 2.9 feet. 2 feet 10 inches 51/64 of an inch

6 0

3 years ago

A school.Ordered 16 buses for a school trip. Each bus has 26 seats. There are 32 teachers and 368 students. Each bus needs to ha

Talja [164]

Answer:

There should be 2 teachers and 21 students on each bus.

Step-by-step explanation:

6 0

3 years ago

All integers that are exactly divisible by 2 are called what?

ivann1987 [24]

Those are called "even numbers".

Also, I guess, "multiples of 2" .

4 0

3 years ago

Read 2 more answers

Solve using substitution, 5x+y=9 10x-7y=-18

BARSIC [14]

Answer:

See below

Step-by-step explanation:

5x + y = 9 re-arrange to y = 9-5x

use this value of 'y' in the second equation:

10x - 7(9-5x) = - 18

solve for x = 1

sub in this value of 'x' into one of the equations to compute 'y'

5 (1) + y = 9

y = 4

6 0

2 years ago