exam Maths Puzzle Numerical Ability

Can someone please help me with this problem it is from a work sheet.

solve the system by graphing
x+y=4
-x=y=2

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exam Other Question
What would the graphs look like if u graphed the equations x=6 and y=-2/5x+4?
I got it from The Shapes of Algebra Linear Problems and inqualities Connected Mathmatics 2. You are s I am supposed to simplify this problem and I am not sure I have done it correctly.

2+2/5 / 2-1/2

is the answer 8/5?