Document page
mathematicsprinted 34 · PDF 35
165 pagesrevision 46935
printed 34 · PDF 35
Page image rendered from the stored file at 110 dpi; it sharpens as you zoom. Outlines are placed from each region’s stored position on the page (595 × 842 pt).
readable
Source of this text: embedded text layer. The better of the embedded text and OCR is kept.
34
E.g. In the formula w = mg, if w = 50 and m = 5 then the equation 50 = 5g can be
formed
2.2Substitution
What is substitution?
Substitution is where we replace letters in a formula with their values
This allows you to find one other value that is in the formula
How do we substitute numbers into a formula?
Write down the formula, if not clearly stated in question
Substitute the numbers given, using brackets around negative numbers, (-3), (-5) etc
Simplify any calculations if you can
Rearrange the formula if necessary (it is usually easier to substitute first)
Work out the calculation (use a calculator if allowed)
Are there any common formulae to be aware of?
The formula for the equation of a straight line is often used
y=mx+c