book Maths Puzzle Numerical Ability

solve each of the systems of equations. State which systems have no solution or an infinite number of solutions.
1. x-y+2z=3
-6x+y+3z=7
x+2y-5z=-4

2. x-y-2z=3
x+2

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book Other Question
square root of 52abto the 3rd divided by the square root of 13a write a verbal expression for the algebraic expression 4m^2-2m