exam Maths Puzzle Numerical Ability

What is the equation of a line going through points (0,5) (6,2)? Please and thank you.

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exam Other Question

What is the discriminant of (3x+2)x=4-2x? I think the answer is 64 but I need an explaination . Please help me :) can someone please help me with this thank you in advance
if f(x)=4x-3 find the following
f(-1)