exam Maths Puzzle Numerical Ability

Graph the linear eguation
3x+4y=11

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exam Other Question

A solution containing 30% insecticide is to be mixed with a solution containing 50% insecticide to make 200 L of a solutions containing 42% insecticide. How much of each solution should be used? Determine value of (k) as an exact decimal so that the system has no solution.
5x-4y=8
6x+ky=11