If the image of the point (1 -2 3) in the plane 2x+3y-z=7 is the point x, y, z then the value of x+y+z is equal to
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do it yourself but I am telling you the method
Step-by-step explanation:
Khan Academy · Khan Academy
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Systems of equations with substitution: y=-5x+8 & 10x+2y=-2 (video)
Oct 19, 2013
It will help to learn more focusing.
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