3 years ago

When we add/subtract fractions, why do we need denominators?

Mathematics

1 answer:

adoni [48]3 years ago

6 0

Answer:

Step-by-step explanation:

so we know what to add or subtract by

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Helllllpppppp!

Akimi4 [234]

Answer:

Step-by-step explanation:

The system of equations is:

● 3x + 2y = 7

● 2x + 4y = 8

Where x is the price of a single coffee and y is the price of a single coffee

We will solve this simultaneous equations using the graphing method:

The solutions is the intersection point of to the lines.

(Picture below)

The intersection point is (1.5,1.25)

8 0

3 years ago

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5x + 5y = -5 when y = 1 solve for x in 10 points .

san4es73 [151]

Step-by-step explanation:

5x + 5y = -5 , when y = 1

5x + 5.1 = -5

5x + 5 = -5

5x = -5 - 5

5x = -10

x = -10/5

x = -2

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2 years ago

What is the value of x in the equation 0.2(x + 1) + 0.5x = –0.3(x – 4)?

Leokris [45]

$0.2(x + 1) + 0.5x = -0.3(x - 4)$

$0.2x+0.2+0.5x=-0.3x+1.2

 
$

$0.7x+0.2=-0.3x+1.2$

$0.7x=-0.3x+1.2-0.2$

$0.7x=-0.3x+1$

$0.7x+0.3x=1$

$x=1$

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3 years ago

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Rewrite the equation by completing the square x^2-4x=0

Dmitriy789 [7]

Answer:

(x+2)(x-2) = 0

Step-by-step explanation:

7 0

2 years ago

5x^(-2)-17x^(-1)+6 i’m so confused pls help will give brainliest

laila [671]

It's a quadratic equation in disguise. If you let $y=x^{-1}$ , then $y^2=x^{-2}$ , and we can rewrite the equation as

$5y^2-17y+6=0$

Solve for $y$ however you like; we get $y=\dfrac25$ and $y=3$ .

But we want to solve for $x$ , so we have

$y=x^{-1}=\dfrac25\implies x=\dfrac52$

$y=x^{-1}=3\implies x=\dfrac13$

5 0

3 years ago

When we add/subtract fractions, why do we need denominators?​

When we add/subtract fractions, why do we need denominators?