Asked by Sierra Elizabeth
                What is the solution? use elimination . 
4x-y=23
7x-y=21
PLEASE HELPPP!!!!
            
            
        4x-y=23
7x-y=21
PLEASE HELPPP!!!!
Answers
                    Answered by
            Steve
            
    just subtract one from the other to eliminate y:
-3x = 2
Now you can get x, and then plug that in to get y.
    
-3x = 2
Now you can get x, and then plug that in to get y.
                    Answered by
            Sierra Elizabeth
            
    I don't understand?
    
                    Answered by
            Sierra Elizabeth
            
    Where did you get -3x=2??
    
                    Answered by
            Steve
            
    elimination means that you manipulate the equations so that one of the variables is eliminated.
Since the left sides are equal to the right sides, subtracting the left sides from each other and the right sides from each other gives a valid equation.
You can see that if you subtract -y from -y, the result is zero. 4x-7x = -3x, so you are left with
-3x + 0y = 2
    
Since the left sides are equal to the right sides, subtracting the left sides from each other and the right sides from each other gives a valid equation.
You can see that if you subtract -y from -y, the result is zero. 4x-7x = -3x, so you are left with
-3x + 0y = 2
                    Answered by
            Steve
            
    clearly you need to review the material on elimination. Google will provide lots of examples.
    
                    Answered by
            Sierra Elizabeth
            
    So what do we do to find the equation out ?
-3x+0y=2
the answer chosies they gave me are-
a.(11,0)
b.(4,-7)
c.(11,44)
d.(4,7)
    
-3x+0y=2
the answer chosies they gave me are-
a.(11,0)
b.(4,-7)
c.(11,44)
d.(4,7)
                    Answered by
            Steve
            
    clearly there is a typo in the equations, or the answer key is wrong. The equations you gave have solution
x = -2/3
y = -77/3
which you can check by plugging those values into both equations.
(4,-7) is a solution to 4x-y=23
It is also a solution to 7x+y = 21, not the equation you gave.
Be more careful with your postings.
    
x = -2/3
y = -77/3
which you can check by plugging those values into both equations.
(4,-7) is a solution to 4x-y=23
It is also a solution to 7x+y = 21, not the equation you gave.
Be more careful with your postings.
                    Answered by
            Sierra Elizabeth
            
    So the answer i got from that is (4,-7) correct??
    
                    Answered by
            Steve
            
    So, with the correct equations, you'd have to add them to eliminate y:
4x-y=23
7x+y=21
-------------
11x=44
x=4
then plug that into either equation to figure out y.
    
4x-y=23
7x+y=21
-------------
11x=44
x=4
then plug that into either equation to figure out y.
                    Answered by
            Sierra Elizabeth
            
    so, 7 and idk the other one ??
    
                    Answered by
            Sierra Elizabeth
            
    so is it (11,44)??? @steve ??
    
                    Answered by
            Steve
            
    NOOO
It's (4,-7)!
I explained how that pair fits both equations.
try plugging in your numbers and see that they are waaaaaayyyy off!
    
It's (4,-7)!
I explained how that pair fits both equations.
try plugging in your numbers and see that they are waaaaaayyyy off!
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