exam Maths Puzzle Numerical Ability

Help solve this urgently please:
2a^2-2ab+b^2 (when a= 3 and b= -1)
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exam Other Question

In the algebraic slope formula; y=mx+b why is "m" used to identify the slope and "b" the y-intercept? What are the steps to use slope and y-intercept to write and equation and draw a graph?