exam Maths Puzzle Numerical Ability

which equation is bets use for the problem y=-x+6 and x-2y=-6

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What are the values o k which will give 4x^2+(k+7)x+(k+4)=0 equal,real roots? Please help me? The formula V=lvh gives the volume of a rectangular prism,where V represents volume , l represens length , w represents width and h represents height. Solve the formula for h