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I know how to solve 2 simutaneous equations but no idea about 3

i rather the elimination method :P

3x-4y=13

i just need the steps in which to complete it i think

now multiply 1st equation by 2

6x-8y=26

:O how ?

2x-10y-2z=26

now add it with 3rd equation.....

-x-9y=37
Btw does it matter if you add the 2nd to the 3rd eqution instead of 1st to 3rd?

if you add 2nd and 3rd equation, you could not have eliminated 'z'

now can you find 'x' and 'y' ?

y=-4?

x=-1

yes.

now can u find z ?

mhm... I sub x and y into the 1,2,3 equation?

ok z =6 thank you

yes, correct :) ask if any doubts.