exam Maths Puzzle Numerical Ability

2X-3Y-2Z=12
X+4Y+Z=-9
4X+2Y-3Z=6
Question: Solve using linear combination and by matrices. Write the matrices you typed into calculator and the operations it took to solve the system

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exam Other Question

Find the constant of variation K.
m varies directly with n; m= 144 when n=8
These are tough!! I appreciate your time!!! McGraw Hill 6th edition,chapter 6 sec. 4, problem # 52. Thanks again!
Over which interval is the function decreasing?