exam Maths Puzzle Numerical Ability

How would you graph the equation y=0.2x-0.5?

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exam Other Question

Assume that y varies directly as x. If y =4 when x =1/2, find y when x =2 (-3-5)sqrt2+(-4-2)sqrt2 this is supposed to add up to sqrt100 and then into 10 how is this problem done?