Summary of Maths Lesson(20 August 2010)

What we have learnt?


1) Revision and extension of previous lesson

2) Double Intercept formula

Shortcut for checking answers- rewriting an equation (y=mx+c) into (x/a+y/b=1)

Note. The a is the x intercept and the b is the y intercept.

i.e. y= 1/2x-3

3= 1/2x-y

1= x/6-y/3

1=x/6+y/-3


To make this in the form of y=mx+c, cross multiply.

i.e. x/-1+y/5=1

5x-y/-5=1

5x-y= -5

5x-y-5=0

y= 5x-5


TO PONDER ABOUT...

Why is the x intercept (a, 0) and the y intercept (0, b)?


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