exam Maths Puzzle Numerical Ability

a line has a slope of 2/3 and a y-intercept of -4. what is the equation of the line

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exam Other Question

one number is three times another number and their sum is 164.find the number? I NEED HELP! This problem is not coming out right. Here it goes...

Given the function k describe by k(x)=10x find each of the following:
(a) k(-17)
(b) k(8)
(c) k(34)

the answer k(-17) = ?????

PLEASE.....PLEASE....