book Maths Puzzle Numerical Ability

When i worked this problem, the graph did not turn out right. The equation is xsquared-5x+6=0. I have to solve the equation by graphing. could you please help me out?

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book Other Question

Rita rows 12 km upstream and 12 km downstream in 3 hours. The speed of her boat in still water is 9 km/hr. Find the speed of the stream. Write an equation in slope intercept form of the line that passes through (2,-5) with the slope of -2.