exam Maths Puzzle Numerical Ability

1/3x - 1/6y =1/3
1/6x + 1/4y =0

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exam Other Question

what can a and k be so both points are on the graph of function?
points are (1,11) and (2,-19); function is y= a(x+1)^2 + k
how can i find the function so that both poitns are on the graph?? Translate the linear equation 9x - 4y = 200 and 7x - 3y = 200 to a real-life situation