exam Maths Puzzle Numerical Ability

How can I Find the slope and y-intercept.and show it in a graph
7x - 3y = -3

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exam Other Question

How do I proceed with this problem?
Find a, b, and c such that the graph of y= ax^2 + (b times the square root of x) + c goes through the points (0,3), (1,-1/2), and (4,3). Any help would be much appreciated. how do you simplify (x^(y+1)+z^2)(x^(y-1)-z^2)