What is the answer to this horrific question my teacher just burst me with in my homework if limx→4g(x)=0 and limx→4k(x)=8, what is the value of limx→4[g(x)–k(x)]?

Nine more than four times a number is the same as one less than twice the number. find the number?

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What is the slope of the line that contains the points (-2,1) and (0,-3)