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BlackZzzverrR [31]
3 years ago
15

X+2y+1=0,2x-3y-12=0 solve by substitution method​

Mathematics
1 answer:
Kitty [74]3 years ago
3 0

Answer:

Step-by-step explanation:

x=-1-2y

-2-4y-3y-12=0

-7y=14

y=-2

x=3

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If I get 27 questions correct and the percent is 90 how many questions are there?
Mamont248 [21]
27 is 90% of 30. Hope that helps.
6 0
3 years ago
Let the matrix below act on C². Find the eigenvalues and a basis for each eigenspace in C².
forsale [732]

Hello, let's note A the matrix, we need to find \lambda such that A\lambda=\lambda I, where I is the identity matrix, so the determinant is 0, giving us the characteristic equation as

\left|\begin{array}{cc}1-\lambda&3\\-3&1-\lambda\end{array}\right|\\\\=(1-\lambda)^2+9\\\\=\lambda^2-2\lambda+10\\\\=0

We just need to solve this equation using the discriminant.

\Delta=b^2-4ac=2^2-40=-36=(6i)^2

And then the eigenvalues are.

\lambda_1=\dfrac{2-6i}{2}=\boxed{1-3i}\\\\\lambda_2=\boxed{1+3i}

To find the basis, we have to solve the system of equations.

A\lambda_1-\lambda_1 I=\left[\begin{array}{cc}3i&3\\-3&3i\end{array}\right] \\\\=3\left[\begin{array}{cc}i&1\\-1&i\end{array}\right] \\\\\text{For a vector (a,b), we need to find a and b such that.}\\\\\begin{cases}ai+b=0\\-a+bi=0\end{cases}\\\\\text{(1,-i) is a base of this space, as i-i=0 and -1-}i^2\text{=-1+1=0.}

A\lambda_2-\lambda_2 I=\left[\begin{array}{cc}-3i&3\\-3&-3i\end{array}\right] \\\\=3\left[\begin{array}{cc}-i&1\\-1&-i\end{array}\right]\\\\\text{For a vector (a,b), we need to find a and b such that.}\\\\\begin{cases}-ai+b=0\\-a-bi=0\end{cases}\\\\\text{(1,i) is a base of this space as -i+i=0 and -1-i*i=0.}

Thank you

4 0
3 years ago
–4.36 − 1.6g + 7.4 = 0.3g + 6.46
Art [367]

Answer:

g = 10.82

_______ or 5.694736842105263

-1.9

Step-by-step explanation:

- 1.6g - 0.3g = 6.46 + 4.36

-1.9g = 10.82

g = 10.82

_____

-1.9

5 0
3 years ago
How do you simplify 19/228
Brilliant_brown [7]

you find what they both divide by and then divide each one and then you keep doing that until you cant no more

3 0
3 years ago
Read 2 more answers
Write an inequality that represents the graph.
Dimas [21]

Answer:

y=2x+1

Step-by-step explanation:

Y intercept is 1 and slope is 2/1

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3 years ago
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