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1. October 4, 2012
Linear graphs I
2. Harder straight line equations
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2. Explanation October 4, 2012
Some straight line equations take the form
A multiple of x + a multiple of y = a number
For example 4x + 3y = 12 y
4
Work out the value of y, when x is 0 3
2
4 × 0 + 3 × y = 12 1
-4 -3 -2 -1 0 1 2 3 4 x
y =4 (0,4) -1
-2
Work out the value of x, when y is 0 -3
-4
4 × x + 3 × 0 = 12
x =3 (3,0)
Plot the points and join them with a straight line.
Check a point on the line. 6
4 × 1.5 + 3 × 2 = 12
6 
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