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Drupady [299]
3 years ago
10

-2x-9y=-25 -4x-9y=-23 system with elimination

Mathematics
2 answers:
REY [17]3 years ago
4 0
Multiply the first equation by -2. It turns into 4x+18y=50 and the other one stays -4x-9y=-23. Then you "eliminate" the equations by "adding" them. Set it up like this: 
4x+18y=50
      +
-4x-9y=-23
4x-4x= 0. 18y-9y= 9y and 50-23= 27
SO: 9y= 27 and y= 3
And then you plug that in to one equation: 4x +18(3)= 50. 4x= 50-(18*3)
4x= -4, so x=-1.
Plug it back in to check! 
Hope this helps. Happy solving! :)
Sphinxa [80]3 years ago
3 0
Tyw23456 explained it quite masterfully, but here is another way to solve the system. Start by multiplying one equation by -1 so later when we add them, the like terms with variable y will be eliminated so we can solve for x:

-1(-2x - 9y = -25) <span>→ (2x + 9y = 25)</span>

Now add the equations (we can factor a -1 out of the bottom equation for a subtraction problem):

    2x + 9y = 25
- (4x + 9y = 23)
----------------------
  -2x        =    2

Now solve for x:

-2x = 2

x = -1

Now we can plug this value back into one of the original equations to solve for y:

-2(-1) - 9y = -25

2 - 9y = -25

-9y = -27

y = 3
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leva [86]

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Step-by-step explanation:

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5 0
3 years ago
If the point (3,5) is on f(x) find the corresponding point on the graph of y=(x+2)+1
ad-work [718]

The corresponding point to the point given (3,5) which is on the graph of f(x) as described in the task content is; (3,6).

<h3>What is the corresponding point to the given point (3,5) as given in the task?</h3>

It follows from the task content that the point given originally is; (3,5).

However, it is required that the point which is equivalent to the given point on the graph of y=(x+2)+1 be identified.

It therefore follows that the point required as in discuss is;

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1 year ago
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Explanation:

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3 years ago
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3 years ago
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Zielflug [23.3K]

I don't know about the first one but for the second one:

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