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pentagon [3]
3 years ago
13

In problems like -20≤5y, when you divide by 5 do you reverse the symbol because -20 is negative?

Mathematics
2 answers:
vampirchik [111]3 years ago
8 0
No, you only reverse the symbol when the divisor is negative
vitfil [10]3 years ago
8 0

No, you only reverse the symbol if you multiply or divide a negative number to both sides of the inequality.

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There is no point of the form (-1, y) on the curve where the tangent is horizontal

Step-by-step explanation:

Notice that when x = - 1. then dy/dx becomes:

dy/dx= (y+2) / (2y+1)

therefore, to request that the tangent is horizontal we ask for the y values that make dy/dx equal to ZERO:

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And we obtain y = -2 as the answer.

But if we try the point (-1, -2) in the original equation, we find that it DOESN'T belong to the curve because it doesn't satisfy the equation as shown below:

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