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3 years ago

If f(x) = 2x + 3, what is f(–1)?

Mathematics

2 answers:

Helen [10]3 years ago

7 0

Answer:

Normally, sequences don't go behind 1, but let's see for this one.

f(-1) = 1

Step-by-step explanation:

Let's sub for -1 in x.

f(-1) = 2(-1) + 3.

f(-1) = -2 + 3

f(-1) = 1

prohojiy [21]3 years ago

6 0

Answer:1

Step-by-step explanation:

f(x)=2x+3

f(-1)=2(-1)+3

f(-1)=-2+3

f(-1)=1

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Hatshy [7]

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3 years ago

The area of a circle is 19.7cm². what is the radius?

Luba_88 [7]

Step-by-step explanation:

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2 years ago

Does the line represented by the equation: y=-2x+5 have a positive slope?

Veronika [31]

Answer:

Step-by-step explanation:

No, it doesn’t have a positive slope because the negative sign in front 2 means that the slope is negative and going down. If the slope would’ve been positive than there wouldn’t have been a negative sign and it would go up.

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3 years ago

PLEASE ANSWERRRRRRRRRR

mash [69]

Answer: OPTION B.

Step-by-step explanation:

Given the following System of equations:

$\left \{ {{3x-5y=19} \atop {x+y=1}} \right.$

You can use the Elimination Method to solve it. The steps are:

1. You can mutliply the second equation by -3.

2. Then you must add the equations.

3. Solve for the variable "y".

Then:

$\left \{ {{3x-5y=19} \atop {-3x-3y=-3}} \right.\\.....................\\-8y=16\\\\y=\frac{16}{-8}\\\\y=-2$

4. Now that you know the value of the variable "y", you must substitute it into any original equation.

5. The final step is to solve for "x" in order to find its value.

Then:

$x+(-2)=1\\\\x=1+2\\\\x=3$

Therefore, the solution is:

$(3,-2)$

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3 years ago

Which of the following statements is true?

vlada-n [284]

The number -4 is a whole number

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3 years ago