8097
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<mdoxml version="1.0"><p>Charlie wants to draw a straight line graph that passes through (0,4) and (1,6):</p>
<p>"I can start my graph on the y axis at y=4. Then I need to go along 1 and up 2 to get to (1,6). I can carry on going along 1 and up 2 to get to the other points on the line, so the y coordinate is always $4 + 2 \times$ the $x$ coordinate, $y = 4 + 2x$."</p>
<p>Can you find similar expressions to describe the following lines?</p>
<p>*some pairs of points go here*</p>
<p> </p>
<p>Alison wants to draw a straight line graph that passes through (0,4) and (5,0).</p>
<p> </p></mdoxml>
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precursor to polynomial interpolation
Problem to lead up to Steve's polynomial interpolation