01 May 2013

SIMULTANEOUS LINEAR EQUATIONS ( SUBSTITUTION METHOD)

Solve the following simultaneous linear equatioans
x = 6 - y
3x = 20 - 4y

Solution : SUBSTITUTION METHOD
x = 6 - y                  -------------(1)
3x = 20 - 4y            -------------(2)

Substitute (1) into (2)
3(6 - y) = 20 - 4y
18 - 3y = 20 - 4y
-3y + 4y = 20 - 18
y = 2

From (1) subtitute y = 2
x = 6 - 2
x = 4


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