exam Maths Puzzle Numerical Ability

how do you find the y coordinates from the equation f(x)= -4x+2

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exam Other Question

One pipe can fill a tub in 12 minutes. Another pipe can fill it in only 8 minutes. How long would it take both pipes to fill the tub? SOLVE FOR a. a-g divided by ag = L
my answer is a= -g/gL-1
is that correct?