juanaandrea
-y - 2 = x + 1 is a decreasing function
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raffle_snaffle
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make it a function of y respect to x
abb0t
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Yes. If you put it in the form: \(\sf \color{red}{y=mx+b}\) You will see
juanaandrea
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ok so it is increasing y=-2x+1
raffle_snaffle
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what makes you say it's increasing?
juanaandrea
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sorry decreasing
abb0t
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Yes.
raffle_snaffle
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okay right!
anonymous
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god help us
it is not your fault, but
\[-y - 2 = x + 1\] is not a function at all
it is an equation
abb0t
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It's a linear function, no?
juanaandrea
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I have it in my homework it says if it is increasing or decreasing
juanaandrea
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yes
anonymous
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no it is not a linear "function"
it is an equation for a line
thus beginning the long confusion between the concept of "function" and "equation"
it is not your fault
just bad math teachers
juanaandrea
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aaaa
anonymous
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anyway what they want you to do is solve for \(y\)
\[-y - 2 = x + 1\]
\[-y=x+3\]
\[y=-x-3\]
juanaandrea
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but is it increasing or decreasing
anonymous
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and then say "since the slope is negative, it is decreasing
anonymous
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\[y=-x-3\\y=mx+b\]
\[m=-1\] so it is decreasing
juanaandrea
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ok thank you. was not sure
anonymous
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yw sorry you have such a crappy book
juanaandrea
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y = -5x + 4 so this one is increasing right
juanaandrea
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i meant decreasing sorry didnt see the -
anonymous
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yeah, decreasing
juanaandrea
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k thanks