exam Maths Puzzle Numerical Ability

how do i determine whether the graphs of the equation are perpendicular lines?
4y=x+5
9y+3x=2

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exam Other Question

Find the iength and width or a rectanguler lot with a perimeter of 88 meters if the length is 4 meters more than the width. I need help solving this problem Thanks

simplify
-9(y-1)