book Maths Puzzle Numerical Ability

solve the system using the subsitutin method....-2x+y=6 and 4x-2y=5 how do i do this?

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on my question muber 4 this is the problem (l=a strait up and down line) l6-14l-2.5(7) please help me i really need ur help solving this equation: 21x+3=121