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

The cost of renting a car from Enterprize is $25 per day and $0.20 per mile. The cost of renting a car from Aris is $32 per day regardless of the mileage. Write each rental agencie let r(x)=x+1/x-1 If T(X)=R(x)+1, Then T(x)=

T(x)=2x/x+1

T(x)=x+2/x+1

T(x)=x+2/x-1

T(x)= 2x/x-1