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3 years ago

Use elimination to solve the system below: 4x – 3y = 22 2x – y = 10

Mathematics

1 answer:

Monica [59]3 years ago

3 0

Answer:

Y = -2, X = 4

Step-by-step explanation:

When you first use the elimination method, you would multiply 2x-y = 10 by -2 so that you could get the 4x to be eliminated.

4x-3y = 22

(2x-y = 10)-2 = -4x + 2y = -20

When you add those 2 together you are left with -y = 2, which you divide by negative to get y = -2. Then you substitute -2 for y to solve for x. I substituted the bottom equation

2x - (-2) = 10

2x +2 = 10

2x = 8

Divide both sides by 2 to get x = 4.

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4 0

3 years ago

Read 2 more answers

I thought of a number, added 3 2/7 to it, then I multiplied the result by 1 1/2 , and got

horsena [70]

Answer:

$\frac{25}{21}$

Step-by-step explanation:

First let's convert the mixed numbers into improper fractions.

$3\frac{2}{7}=\frac{23}{7}$

$1\frac{1}{2}=\frac{3}{2}$

$6\frac{5}{7}=\frac{47}{7}$

Let the number be n, so we can write an equation from the word problem as:

$(n+\frac{23}{7})*\frac{3}{2}=\frac{47}{7}$

Now, we do algebra and solve for n:

$(n+\frac{23}{7})*\frac{3}{2}=\frac{47}{7}\\\frac{3}{2}n+\frac{69}{14}=\frac{47}{7}\\\frac{3}{2}n=\frac{47}{7}-\frac{69}{14}\\\frac{3}{2}n=\frac{25}{14}\\n=\frac{\frac{25}{14}}{\frac{3}{2}}\\n=\frac{25}{14}*\frac{2}{3}\\n=\frac{50}{42}\\n=\frac{25}{21}$

hence the number is 25/21

5 0

4 years ago

What is X<br>No working needed

Akimi4 [234]

3/6 I hope i can help

8 0

3 years ago

Is 17/23 a irrational number

adoni [48]

Answer:

NO.

Step-by-step explanation:

An irrational number cannot be written as a fraction.

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3 years ago

I don't understand how to begin this problem

Ronch [10]

I would first add 5 and 2 together, then multiply that by 3. Finally you would subtract the 1. After solving for what is inside the parentheses you would multiply it by 2 for your final answer.

2•(3(5+2)-1)
2•(3(7)-1)
2•(21-1)
2•(20)
40

7 0

3 years ago