The point 6,2 lies on the line -x - 8y = -22. Determine if this point is a solution of the system. -x - 8y = - 22 and -7x + 3y = -36.    

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You go ahead and plug in the value x=6 and y=2 in the equations-6-16=-22 which is same as the answer given. So yes.-42+6=-36 , which is same as the answer given. So yes