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4 years ago

Solve this system of equations using

Mathematics

2 answers:

Neporo4naja [7]4 years ago

8 0

Answer: Please Mark Brainliest :) !!

The answer is x= 6 and y= 27.

Step-by-step explanation:

3x + 9 = 5x + 3

-2x + 9 = -3

y = 5x -3

x = 6

y = 5x -3

y = 5(6) -3

y = 27

denis23 [38]4 years ago

5 0

First, when solving for x, you would need to make one of the equation into standard form, which would be Ax + By = C. So, I'm going to use y = 5x -3.

y = 5x - 3 || subtract -5x on both sides from the equal sign

5x + y = -3 || there you have one equation in standard form

Now, all you have to do now is substitute the y-intercept form equation into the standard form equation. As you can see, you would substitute the y-intercept form into the y in the standard form equation.

5x + y = -3

5x + 3x + 9 = -3 || combine like terms

8x + 9 = -3 || subtract 9 on both sides from the equal sign

8x = 6 || divide by 8 on both sides from the equal sign

x = 0.75 || final answer for x

Then for solving y, take any equation in y-intercept form and substitute with the x in the equation, which I'm going to use y = 3x + 9 in this case.

y = 3x + 9 || substitute with x

y = 3 (0.75) + 9 || multiply 3 and 0.75

y = 3.75 + 9 || add 3.75 and 9

y = 12.75 || final answer for y

Thus, x = 0.75 and y = 12.75.

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liberstina [14]

Answer:

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Step-by-step explanation:

Hello,

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So here we can write

$x(x+1)=72\\ x*x+x*1=72\\ x^2 + x -72 = 0\\$

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3 years ago

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Pavlova-9 [17]

Answer:

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3 years ago

-2b + 9 = 25 ones step and two step equation Screenshot of example

ycow [4]

Answer:

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Step-by-step explanation:

-2b + 9 =25

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2 years ago

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Brrunno [24]

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4 years ago

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hodyreva [135]

Answer:

3x^2 + 3xz + 2y^2 - 2yz - xy

Step-by-step explanation:

(1) multiply it to get

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we get -xy

and then after that simplifying we get 3x^2 + 3xz + 2y^2 - 2yz - xy

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3 years ago

Read 2 more answers