book Maths Puzzle Numerical Ability

If two numbers ave the sam esign, the product is,...

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book Other Question

Find the distance between the pair of points whose coordinates are given. Express answers in simplest form using radicals or as decimal approximations.
(7,2)(-5,7)

I'm not qui I need to know how to graph
x+y=4
x+y=9

and i also need to know how many solutions it has.
can you help me please? thanks a lot!