exam Maths Puzzle Numerical Ability

Graph the parabola.

y=-1/2x^2+3

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exam Other Question

1/3+(-5/6) + (-1/2) =?

{-27+14}=?

-1/2-(5/8)=?

-3.4-(7.6)=?
how do I graph 2y+5x=-2

I came up with (0,-1) and (-2/5,0) but do not know if it is correct and if so how to graph