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3 years ago

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Solve by the linear combination method (with or without multiplication) 2x+3y= -17, 5x+2y = -4

2 answers:

Amiraneli [1.4K]3 years ago

6 0

2x+3y= -17
5x+2y= -4
You must cancel either the x or y out to solve so i'm going to cancel the x.
-5(2x+3y= -17)
2(5x+2y= -4)
This simplifies to:
-15x -15y=85
15x+4y= -8
The -15x and 15x cancel out leaving you:
-15y=85
4y= -8
You add them top numbers by the bottom and get:
-11y=77
Then divide by -11 to get y by its self.
y= -7
Now that you know what y is just plug it in to either original problem. I will use the second one.
5x + 2(-7) = -4
5x -14 = -4
5x = 10
x = 2
So the answer is (2,-7) or x=2 and y=-7

lions [1.4K]3 years ago

6 0

Answer: (2,-7) or x=2 and y=-7

Step-by-step explanation: Took the test and can confirm this is the answer!

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Step-by-step explanation:

Confidence interval is given as mean +/- margin of error (E)

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