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3 years ago

What is the x-value in the solution to this system of linear equations

Mathematics

1 answer:

Yuki888 [10]3 years ago

5 0

Answer:

x = 4

Step-by-step explanation:

2x - y = 11

X + 3y = -5

Multiply the first equation by 3

3(2x - y )= 11*3

6x - 3y = 33

Add this to the second equation to eliminate y

6x - 3y = 33

X + 3y = -5

--------------------

7x = 28

Divide by 7

7x/7 = 28/7

x = 4

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The width of a rectangle is the length minus 7 units. The area of the

AleksandrR [38]

Answer:

8 units

Step-by-step explanation:

here's your solution

=> let the length of rectangle be X

=> then width = x - 7

=> area = 8units

=>> area = length*width

=> area = x (x-7) = 8

=> x^2 - 7 = 8

=> now, x^2 - 7x - 8 = 0

=> factories the above equation by middle term split

=> x^2 - 7x - 8

=> x^2 - 8x + x - 8

=> take the common

=> x(x - 8) + 1(x - 8)

=> (x + 1) (x - 8)

neglect (x + 1) because this will in negative for X

=> x - 8 = 0

=> x = 8

=>so, x = 8

=>length = 8 units

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3 years ago

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4 years ago

When ringing up a customer, a cashier needs 6 seconds to process payment as well as 1

Ivan

Answer:

14 items

Step-by-step explanation:

20 seconds minus the six it takes to process purchase is 14 and if i takes 1 second to scan each item 14 times 1 is 14

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3 years ago

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Ethan burns 650 calories when he runs for 1 hour. Soppose he runs 5 hours in one week

alex41 [277]

650 x 5=3250 calories

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3 years ago

A certain shade of pink us created by adding 3 cups of red paint to 7 cups of white paint

Ipatiy [6.2K]

Answer:

A certain shade of pink us created by adding 3 cups of red paint to 7 cups of white paint

Step-by-step explanation:

Constant of proportionality is the constant value of the ratio of two proportional quantities x and y; usually written y = kx, where k is the factor of proportionality.

To make color pink,

for every 3 cups of red , we need 7 cups of white.

Let 'r' be the cups of red required

let 'w' be the cups of white required

so , as per the question

for 3 r we need = 7 w

r = 7/3 w

so, 7/3 is constant of proportionality

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3 years ago