exam Maths Puzzle Numerical Ability

A projectile is launched upward from the ground level with an initial speed of 98m/s. How high will it go? When will it return to the ground?

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exam Other Question
graph for y = 2x. graph for y = x + 1. 3x-4y=7
2x-y=3

then
3x-4y=7
-8x+4y=-12

adding

-5x=-5 then x=1 then 3-4y=7 then 4y=-4 then y=-1
Solution: x=1,y=-1