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2 years ago

You need to solve a system of equations. You decide to use the elimination method. Which of these is not allowed? 2x - 3y = 12

Mathematics

1 answer:

suter [353]2 years ago

6 0

Answer:

Step-by-step explanation:

The Elimination Method is the method for solving a pair of linear equations which reduces one equation to one that has only a single variable.

If the coefficients of one variable are opposites, you add the equations to eliminate a variable, and then solve.

If the coefficients are not opposites, then we multiply one or both equations by a number to create opposite coefficients, and then add the equations to eliminate a variable and solve.

When multiplying the equation by a coefficient, we multiply both sides of the equation (multiplying both sides of the equation by some nonzero number does not change the solution).

So, option B is not allowed (it is not allowed to multiply only one part of the equation)

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3 years ago

A parcel delivery service will deliver a package only if the length plus girth (distance around) does not exceed 84 inches. (A

Kisachek [45]

Answer:

A. 14x14x28

B. The maximum volume is 5488 cuibic inches

Step-by-step explanation:

The problem states that the box has square ends, so you can express volume with:

$v=x^{2} y$

Using the restriction stated in the problem to get another equation you can substitute in the one above:

$4x+y=84\\\\$

Substituting <em>y</em> whit this equation gives:

$v=x^{2} (84-4x)\\\\v=84x^{2} -4x^{3}$

Now find the limit of <em>x</em>:

$\frac{84x^{2}-4x^{3}}{dx}=168x-12x^{2}\\\\x=\frac{168}{12}=14$

Find the length:

$y=84-4(14)=28$

You can now calculate the maximum volume:

$v=(14)^{2}(28)= 5488$

6 0

3 years ago

Which algebraic expression is equivalent to the expression below 6(2x+5)+4x

Veronika [31]

12x+30+4
12x+34

This is 12x + 34 because when we combine all like terms, we get it.

6 0

2 years ago

In it 34/50 of the coins are quarters what percent of the coins are quarters

ziro4ka [17]

Answer:

68% are quarters

Step-by-step explanation:

Percent means out of 100

34/50

Multiply by 2/2

34/50 *2/2

68/100

This means 68 percent

4 0

3 years ago

(Write the fraction as a mixed number) Anyone able to help out with my 4 questions?

s344n2d4d5 [400]

Yes ! I can help you.

-- Take each fraction.

-- Do the division . . . (top number) divided by (bottom number) .

-- Write the whole number from the quotient.
Save the remainder.

-- After the whole number, write a fraction.
Copy the original bottom number to the bottom of the fraction.

-- Copy the remainder from the division to the top of the fraction.

Bada-bing ! There's your mixed number.

7 0

2 years ago

Read 2 more answers