exam Maths Puzzle Numerical Ability

Determine which two equations represent parallel lines.(a) y = x + 4 (b) y = x - 7 (c) y = 2x + 8 (d) y = 2x - 4

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One poll reported that 42% of city residents were against building a new civic center. The polling service stated that the poll was accurate to within 2.5%. What is the minimum percent of city residents that oppose the civic center? Thanks Write an equation of the line that passes through (9,6) and is perpendicular to the line whose equation is y=-1/3(x)+7.