1. G Dear ©2009 – Not to be sold/Free to use
Stage 5
Year 9
Simultaneous
Equations
Guess, Check
and Refine.
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G Dear ©2009 – Not to be sold/Free to use

2. What is the simultaneous solution below?
Guess, Check and Refine
What is the simultaneous solution below?
y = 2x + 1
y = 3x - 1
Y = 2 x 0 + 1
Y = 3 x 0 - 1
Try x=0 
Y = 1
Y = -1
Y = 2 x 1 + 1
Y = 3 x 1 - 1
Try x=1 
Y = 3
Y = 2
Y = 2 x 2 + 1
Y = 3 x 2 - 1
Try x=2 
Y = 5
Y = 5
Solution = (2,5)
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3. What is the simultaneous solution below?
Guess, Check and Refine
What is the simultaneous solution below?
y = x + 2
y = 2x - 1
Y =
Y = 2 x 1 - 1
Try x=1 
Y = 3
Y = 1
Y =
Y = 2 x 2 - 1
Try x=2 
Y = 4
Y = 3
Y =
Y = 2 x 3 - 1
Try x=3 
Y = 5
Y = 5
Solution = (2,5)
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