exam Maths Puzzle Numerical Ability

identify the numerical coefficient of the term z

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exam Other Question

can you please assist me with the following problems.
1.solve the system of linear equation by graphing: 4x-y=6 and 3x+y=1

2.use elimination to solve : 4x-y=-3 and 5x Solve 2/3(6x+30)=x + 5(x+4)-2x