exam Maths Puzzle Numerical Ability

Solve each system by the addition method

2x+3y+11
7x-4y+6


and


2x-y=-5
3x+2y=3

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exam Other Question
(x + 1)(x + 1)

this one is the last homework problem question...thank again! when solving inequalities, how do you know whether to subtract or to add on


both sides? for example, 5x-4<6x+2.