book Maths Puzzle Numerical Ability

18bsquareda-4ba+7absquare

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how would you find the slope of 8x+9y=86 and what is y-intersept,x-intersept what would be the new equation for this aint a math question but want to know. for I am a tutor just like you started say a week ago and each time I get on my score drops. wondering why. for look at others and theres dont drop.