exam Maths Puzzle Numerical Ability

Determine which two equations represent perpendicular lines.
(a) y = 4x - 7
(b) y = x + 7
(c) y = - x + 7
(d) y = x - 7

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exam Other Question

Find the domain and range of the function
{{{{{18x^2-2}}}}}
Domain:
Range:
write the answer in interval notation. for the range just remember that x^2 is never ne Hello. Can you please help me with this? I need to complete the given pairs so that each ordered pair satisfies the given equation.

x+2y=1 (0, ) (-2, ) (2, )

I appreciate your help and thank you so much in advance.