Practice Problems (Junior Cert Mathematics): Flashcards

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2x−3y=142x-3y=14, 2x−y=102x-y=10: x=?

x=4x=4

2x−3y=142x-3y=14, 2x−y=102x-y=10: y=?

y=−2y=-2

3x+y=53x+y=5, 5x−4y=−35x-4y=-3: x=?

x=1x=1

3x+y=53x+y=5, 5x−4y=−35x-4y=-3: y=?

y=2y=2

2x−y=122x-y=12, 3x+2y=113x+2y=11: x=?

x=5x=5

2x−y=122x-y=12, 3x+2y=113x+2y=11: y=?

y=−2y=-2

2x−3y=142x-3y=14, 2x−y=102x-y=10: multiply eq 2 by?

−3-3

3x+y=53x+y=5, 5x−4y=−35x-4y=-3: multiply eq 1 by?

44

2x−y=122x-y=12, 3x+2y=113x+2y=11: multiply eq 1 by?

22

Method: cancel variables in simultaneous eqs

Elimination method

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