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If [[4,5],[-y,2x]]=[[3,4],[5,-8]]',then ...

If `[[4,5],[-y,2x]]=[[3,4],[5,-8]]'`,then `x-y` is :

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If [[x+3,4],[y-4,x+y]]=[[5,4],[3,9]], then find x and y

If [[x+3,4],[y-4,x+y]]=[[5,4],[3,9]] find x and y .

Find X and Y if, X+2Y = [[4,5],[3,8]] and 2X-Y = [[5,-2],[-1,1]]

If the mean of 2, 4, 6, 8, x and y is 5, then x + y is ______.

2x+3y=3 4x+5y=3

2x+3y=0 3x+4y=5

4x+3y=5, 2x-y=2

2x+3y=8 4x-5y=-6

If x:y=4:5 , then (2x+3y): (8x-5y) is equal to :