Your teacher should have given you what X= alternativly what Y= then you should work out what either X or Y stands for. Take your first equation for example..
2x-y=4
Q. IF X EQUALS 2 WHAT IS Y?
Substitute x with four
2(2)-y=4
Now times 2 by the number in the brackets
2x2=4
so the equation now reads
4-y=4
in this case
Y=zero
remember this is just an example! Insert the value of Y or X into your equations and work it out!
solve the system of equations
2x-y=4 and 4x+y=2
Thanks.
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