book Maths Puzzle Numerical Ability

14xsquared + 35x + 21 / 12xsquared + 30x +18

cant figure out how to do it

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I need help on this problem. Thankx
What is Sn for the arithmetic series with d = -4, an = 27, and n = 9? I need help finding the slope and y-intercepts of each equation, and graping for the following equations:
y=x+2
y+3=-1/3x
y=2x-1
y-3/5x=-2
y=1/2x-4
y-2x=-3
y=2/5x+3
y+1/3x=-2
y=-x-2
y-6=-2x