exam Maths Puzzle Numerical Ability

Graph x + y = -2.

I am not sure or remember how to do this. Can someone help me with this. Thanks

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how do i do this?


Write the answer in scientific notation

2.00*10(to the 5th power)*5.00*10(to the -3rd power).


explain it please.
:) graph each system one solution no solution many solution

4x-2y=-6
2x-y=-3