exam Maths Puzzle Numerical Ability

simplify

6.7x(3x-2y)+1.2(x^2-y^2)

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exam Other Question

I need to solve the equation y=3x & x=3y for both x & y. I can not come up with an answer that makes sense. write the equation in standord form of the horizontal and veritcal lines that pass through the point.

17. (2,4) 18. (-5,4)

please help me these problems have been hunating me for days