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forsale [732]
3 years ago
7

5 less than 3 times a number is 7. How would I write this as an equation

Mathematics
2 answers:
sladkih [1.3K]3 years ago
5 0
You want to break this down.

“5 less than” means you’ll subtract 5 from something.

That something is “3 times a number.” “3 times a number” means 3•x or 3x, since we’ll use x for that unknown number.

So, “5 less than 3 times a number” means “subtract 5 from 3x”: 3x-5

“Is” means “equals”. So 3x-5= something.

7, well, that’s 7.

So “5 less than 3 times a number is 7” means ”subtract 5 from 3x and set that equal to 7.”

3x-5=7
ValentinkaMS [17]3 years ago
3 0

Answer:

The equation would be 5-3x=7

Step-by-step explanation:

5 less than indicates subtraction, and 3 times a number indicates both values being multiplied with each other, so it's 3x. Hope that helped.

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3 years ago
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ehidna [41]

Answer:

x=0,-1 and x=

​

​ x=\frac{2+\sqrt{10}}{3},\frac{2-\sqrt{10}}{3}x=

​3

​​  

​​  

Step-by-step explanation:

1 Cancel 2 on both sides.

3{x}^{2}+3x=03x

​2

​​ +3x=0

2 Factor out the common term 3x3x.

3x(x+1)=03x(x+1)=0

3 Solve for xx.

x=0,-1x=0,−1

1 Move all terms to one side.

3{x}^{2}-3x-1-x-1=03x

​2

​​ −3x−1−x−1=0

2 Simplify  3{x}^{2}-3x-1-x-13x

​2

​​ −3x−1−x−1  to  3{x}^{2}-4x-23x

​2

​​ −4x−2.

3{x}^{2}-4x-2=03x

​2

​​ −4x−2=0

3 Use the Quadratic Formula.

x=\frac{4+2\sqrt{10}}{6},\frac{4-2\sqrt{10}}{6}x=

​6

​

​4+2√

​10

​

​​  

​​ ,

​6

​

​4−2√

​10

​

​​  

​​  

4 Simplify solutions.

x=\frac{2+\sqrt{10}}{3},\frac{2-\sqrt{10}}{3}x=

​3

​

​2+√

​10

​

​​  

​​ ,

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7 0
3 years ago
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Step-by-step explanation:

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6 0
2 years ago
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Varvara68 [4.7K]
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There are many ways to solve these equations. Adding them together, you get
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Since this value is less than 12, it is the smaller number. The smaller number is 5.
4 0
3 years ago
Quadrilateral ABCDABCDA, B, C, D is reflected across line mmm to create quadrilateral A'B'C'D'A
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Answer:

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