exam Maths Puzzle Numerical Ability

Find the equation of the linear fucntion in standard form whose graph passes through (1,-4) and its perpendicular to the line whoes x-intercept is 3 and y-intercept is -2.

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exam Other Question

Evaluate the function of the indicated values
f(x) =4[[x-6]]-9
(i) f(4) (ii) f(2.9) (iii) f(9/8)
I can't figure this one out. Thanks! how to solve this by Q.F
(x-l)(x-m)+(x-m)(x-n)(x-n)(x-l)=o

Please reply me ok