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Kipish [7]
3 years ago
8

Solve the system by substitution. 6x + 3y = -6 2x + y = -2

Mathematics
2 answers:
Mariana [72]3 years ago
8 0
Solutions 

First Lets solve for this equation 6x + 3y = -6
 

6x + 3y = -6
 

6x+3(-2-2x)=-6

 
 

-6=-6 

Therefore this given equation is a <span>dependent system. 
</span>
<span>Solve for </span>2x + y = -2 

2x+y=-2 

y=-2-2x&#10;&#10; &#10;&#10; &#10; 

There are too many solutions to these equations. 


Simora [160]3 years ago
5 0
6x + 3y = -6
2x + y = -2

Solve both equations for the same variable, in this case, I'll solve for y.

2x + y = -2   Subtract 2x from both sides
y = -2x -2

6x + 3y = -6         Subtract 6x from both sides
        3y = -6x -6   Divide both sides by 3
          y = -2x -2  

Once you have them solved you can set them equal to each other and solve.

-2x -2 = -2x -2 

But, these two equations are the same, so any number you put in for x will work. The answer to the system is infinite solutions.

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Solve the following equation by factoring:9x^2-3x-2=0
olya-2409 [2.1K]

Answer:

The two roots of the quadratic equation are

x_1= - \frac{1}{3} \text{ and } x_2= \frac{2}{3}

Step-by-step explanation:

Original quadratic equation is 9x^{2}-3x-2=0

Divide both sides by 9:

x^{2} - \frac{x}{3} - \frac{2}{9}=0

Add \frac{2}{9} to both sides to get rid of the constant on the LHS

x^{2} - \frac{x}{3} - \frac{2}{9}+\frac{2}{9}=\frac{2}{9}  ==> x^{2} - \frac{x}{3}=\frac{2}{9}

Add \frac{1}{36}  to both sides

x^{2} - \frac{x}{3}+\frac{1}{36}=\frac{2}{9} +\frac{1}{36}

This simplifies to

x^{2} - \frac{x}{3}+\frac{1}{36}=\frac{1}{4}

Noting that (a + b)² = a² + 2ab + b²

If we set a = x and b = \frac{1}{6}\right) we can see that

\left(x - \frac{1}{6}\right)^2 = x^2 - 2.x. (-\frac{1}{6}) + \frac{1}{36} = x^{2} - \frac{x}{3}+\frac{1}{36}

So

\left(x - \frac{1}{6}\right)^2=\frac{1}{4}

Taking square roots on both sides

\left(x - \frac{1}{6}\right)^2= \pm\frac{1}{4}

So the two roots or solutions of the equation are

x - \frac{1}{6}=-\sqrt{\frac{1}{4}}  and x - \frac{1}{6}=\sqrt{\frac{1}{4}}

\sqrt{\frac{1}{4}} = \frac{1}{2}

So the two roots are

x_1=\frac{1}{6} - \frac{1}{2} = -\frac{1}{3}

and

x_2=\frac{1}{6} + \frac{1}{2} = \frac{2}{3}

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