exam Maths Puzzle Numerical Ability

How do you find points when there is no x like 2y=5
or how do I find a point when there is no y like x+6=0

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The problem says: Find all zeros of: {{{ Q(x)=x^6-4x^5+5x^4-x^2+4x-5 }}}. I used Decartes Rule of Signs, Rational Zeros Theorem, and synthetic division to find that x=-1 and x=1 i need to write a slope-intercept equation with these characteristics. please help me

m= -2, passes through (-5,1)

can you break it down easy for me thanx