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Mashutka [201]
3 years ago
10

How do you find x in the equation 3x+21=42 Plz help will mark brianltes

Mathematics
2 answers:
Rus_ich [418]3 years ago
4 0

Answer:

3x=21

X=7

Step-by-step explanation:

irinina [24]3 years ago
3 0

Answer:

X=7

Step-by-step explanation:

3x=21

x=7

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Answer:

Solve for the first variable in one of the equations, then substitute the result into the other equation.

Point Form:(30/19,2/19)

Equation Form: x=30/19, y=2/19

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Can someone help me with this
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7 0
4 years ago
6 times a number is 27 less than the square of that number. Find the positive solution.
Sedaia [141]

Answer:

9

Step-by-step explanation:

6n = n² - 27

n² - 6n - 27 = 0

n² - 9n + 3n - 27 = 0

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7 0
3 years ago
What is the answe to (3x+2)(3x-2)
cricket20 [7]

Answer:

(3x+2)(3x-2) = 9x² - 4

Step-by-step explanation:

try to use the formula : (a-b)(a+b) = a² - b²

(3x+2)(3x-2) = (3x)² - (2)²

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5 0
3 years ago
Read 2 more answers
Factor 6y 2 - 48 + 42y
algol [13]
<h2>Answer:</h2>

The factorization of the given expression is given by:

           6y^2-48+42y=6(y-1)(y+8)

<h2>Step-by-step explanation:</h2>

To factor a polynomial means to express it as a product of the rational factor of the given expression.

The quadratic expression in terms of the variable y is given by:

6y^2-48+42y

It has three terms such that all the three terms are a multiple of 6 , hence we take out common 6 from each term to get the expression as:

6y^2-48+42y=6(y^2-8+7y)\\\\i.e.\\\\6y^2-48+42y=6(y^2+8y-y-8)\\\\i.e.\\\\6y^2-48+42y=6(y(y+8)-1(y+8))\\\\i.e.\\\\6y^2-48+42y=6(y-1)(y+8)

5 0
3 years ago
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