Asked by Sierra Elizabeth
                What is the solution? use elimination .
4x-y=23
7x-y=21
            
        4x-y=23
7x-y=21
Answers
                    Answered by
            Vstar
            
    You can add both y's together to get no y's and then solve for x after adding 7x and 4x. Then plug in the value of x into one of the equations to find y. 
    
                    Answered by
            Sierra Elizabeth
            
    huh?
    
                    Answered by
            Vstar
            
    sorry think of it as you are adding normally with a bar on the bottom. since you have 22 negative y's you multiply the bottom number by -1 to get a positive y. Then you add the two y's together so you ELIMINATE the y's They are no longer in the problem SO FAR. You then find x. and then substitute the answer you got for x and solve y.
    
                    Answered by
            Vstar
            
    sorry typo two negative y's
    
                    Answered by
            Sierra Elizabeth
            
    So whats the answer??
    
                    Answered by
            Henry
            
    Eq1: 4x - y = 23.
Eq2: 7x - y = 21.
Multiply Eq2 by -1 and add:
+4x - y = 23.
-7x + y = -21.
Sum: -3x = 2.
X = -2/3.
In Eq1, replace x with -2/3 and solve for y.
4(-2/3) - y = 23.
Y = ?
You should get: Y = -77/2 = -25 2/3.
    
Eq2: 7x - y = 21.
Multiply Eq2 by -1 and add:
+4x - y = 23.
-7x + y = -21.
Sum: -3x = 2.
X = -2/3.
In Eq1, replace x with -2/3 and solve for y.
4(-2/3) - y = 23.
Y = ?
You should get: Y = -77/2 = -25 2/3.
                    Answered by
            Sierra Elizabeth
            
    @henry the answer chosies are 
a.(11,0)
b.(4,-7)
c.(11,44)
d.(4,7)
    
a.(11,0)
b.(4,-7)
c.(11,44)
d.(4,7)
                    Answered by
            Henry
            
    None of the give answers satisfy BOTH of
the given equations. Remember that each
answer must satisfy BOTH equations.
My answer: (-2/3,-77/3) satisfies BOTH
equations.
    
the given equations. Remember that each
answer must satisfy BOTH equations.
My answer: (-2/3,-77/3) satisfies BOTH
equations.
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