exam Maths Puzzle Numerical Ability

Would anyone be willing to assist me with these problems. 1. Graph the given relation by the table method. Determine whether the relation is a function. a. 2x-y=4 x is 0,2,4 y is ?

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exam Other Question

write an equation for the ellipse that satisfies each set of conditions.
endpoints of major axis at (-9,0) and (9,0), endpoints of minor axis at (0,3) and (0,-3).

I got x2/9+y2/81=1 is this right? get the algebric expessionin the following casesusing variables,