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Vanyuwa [196]
2 years ago
12

-2x-9y=25 4x+9y=23 solve with elimination

Mathematics
1 answer:
Masja [62]2 years ago
4 0

Answer:

x = 24 and y= −73/9

Step-by-step explanation:

Let's solve your system by elimination.

−2x−9y=25;4x+9y=23

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

−2x−9y=25

4x+9y=23

Add these equations to eliminate y:

2x=48

Then solve2x=48for x:

2x=48

2x/2 = 48/2

(Divide both sides by 2)

x=24

Now that we've found x let's plug it back in to solve for y.

Write down an original equation:

−2x−9y=25

Substitute24forxin−2x−9y=25:

(−2)(24)−9y=25

−9y−48=25(Simplify both sides of the equation)

−9y−48+48=25+48(Add 48 to both sides)

−9y=73

−9y/−9 = 73/−9

(Divide both sides by -9)

y= −73/9

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Step-by-step explanation:

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2 years ago
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Explanation:
\frac{-24}{7} = -3 \frac{3}{7} 
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What is the sum of ∞Σn=1 2(1/5)^n-1? s=1/5 s=2/5 s=5/3 s=5/2
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The sum of the sum notation ∞Σn=1 2(1/5)^n-1 is S= 5/2

<h3>How to determine the sum of the notation?</h3>

The sum notation is given as:

∞Σn=1 2(1/5)^n-1

The above notation is a geometric sequence with the following parameters

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  • Common ratio, r = 1/5

The sum is then calculated as

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The equation becomes

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Express the equation as products

S = 2 * 5/4

Solve the expression

S= 5/2

Hence, the sum of the sum notation ∞Σn=1 2(1/5)^n-1 is S= 5/2

Read more about sum notation at

brainly.com/question/542712

#SPJ1

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