hey guys, i have doubts about tis question
its 2002 p1 simultaneous equation
21c)
x = 2y + 11
4x +3y = 0
i noe i have to rearrange the equation and do but i still cant
get the answer
the answer is x=3 , y= -4
I'm surprised this was found in O levels at all. This is
linear simultaneous equations, taught at sec2 level?
Ok first, label your equations.
x = 2y + 11---------- (1)
4x +3y = 0----------- (2)
There are two ways to do it. I think the way you've learnt for
now is the elimination method. Even though the substitution method
is easier, I'll teach this first.
From 1,
x= 2y + 11
4x = 8y + 44 -------(3)
(2)-(3): 4x+3y - 4x = 0 - (8y + 44)
3y = -8y - 44
11y = -44
y= - 4.
Sub y=-4 back into (2)
4x - 12 = 0
4x = 12
x = 3
