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3 years ago

19 less than 3 times a number is 88

Mathematics

2 answers:

vladimir1956 [14]3 years ago

8 0

Answer:

19-3*x=88

Step-by-step explanation:

(x is the variable not the times!) (this symbol: * means times)

mrs_skeptik [129]3 years ago

5 0

answer :

x = - 23

explanation :

19 - 3x = 88

Break it down :

"19 less than": Means we are going to subtract 19 from a number.

"3 times a number": Pick a variable to represent the number and multiply

that by 3. ex: 3x

Solve : 19 - 3x = 88

- 19 - 19 ( subtract - 19 from both sides,

to get " -3x = 69 " )

-3x = 69

/ -3 / -3 ( divide both sides by -3,

to get your answer, x = -23 )

x = - 23

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Answer:

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Step-by-step explanation:

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3 years ago

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Stells [14]

Answer:

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3 years ago

In this problem we consider an equation in differential form Mdx+Ndy=0. (4x+2y)dx+(2x+8y)dy=0 Find My= 2 Nx= 2 If the problem is

zheka24 [161]

Answer:

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Step-by-step explanation:

Let:

$M(x,y)=4x+2y\\\\and\\\\N(x,y)=2x+8y$

This is and exact equation, because:

$\frac{\partial M(x,y)}{\partial y} =2=\frac{\partial N}{\partial x}$

So, define f(x,y) such that:

$\frac{\partial f(x,y)}{\partial x} =M(x,y)\\\\and\\\\\frac{\partial f(x,y)}{\partial y} =N(x,y)$

The solution will be given by:

$f(x,y)=C_1$

Where C1 is an arbitrary constant

Integrate $\frac{\partial f(x,y)}{\partial x}$ with respect to x in order to find f(x,y):

$f(x,y)=\int\ {4x+2y} \, dx =2x^2+2xy+g(y)$

Where g(y) is an arbitrary function of y.

Differentiate f(x,y) with respect to y in order to find g(y):

$\frac{\partial f(x,y)}{\partial y} =2x+\frac{d g(y)}{dy}$

Substitute into $\frac{\partial f(x,y)}{\partial y} =N(x,y)$

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$g(y)=\int\ {8y} \, dy =4y^2$

Substitute g(y) into f(x,y):

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The solution is f(x,y)=C1

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Solving y using quadratic formula:

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4 years ago

If someone answers this you’re gonna be brainliest

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