29-07-2016
Mathematics

contestada

Solve the simultaneous equations 4x - 2y = 8 and x - 3y= -3
show all workings please, I would prefer the way by adding a 3rd equation

Respuesta :

Ckaranja Ckaranja

29-07-2016

4x-2y=8
x-3y=-3
Multiply equation 2 by 4;
4x-2y=8
4x-12y=-12
Subtracting equation II from equation I;
10y=20
y=2
Replacing the value of y in equation;
4x-2y=8
4x-2(2)=8
4x-4=8
4x=12
x=3

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