exam Maths Puzzle Numerical Ability

I need help in parellel perpendicular line by useing equations.

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exam Other Question

Find an equation to represent the rule used to determine y.

x -5 -2 -1 0 1 2 3 4 x
y 7 -1 -9 wats the dot mean in between 2 numbers wen given a equation......????? i really wanna kno let me give u a example 3.5 *4.6