Answer:
The system of equations is :
Equation 1- ![5x+2y=50](https://tex.z-dn.net/?f=5x%2B2y%3D50)
Equation 2- ![x+2y=30](https://tex.z-dn.net/?f=x%2B2y%3D30)
Number of vinyl doghouse = 5
Number of treated lumber doghouse =12.5
Step-by-step explanation:
Let x be the number of vinyl doghouses
y be the number of treated lumber doghouses
→If it takes the company 5 hours to build a vinyl doghouses and 2 hours to build a treated lumber doghouse. The company dedicates 50 hours every week towards assembling and painting doghouses.
Equation 1- ![5x+2y=50](https://tex.z-dn.net/?f=5x%2B2y%3D50)
→It takes an additional hour to paint each vinyl doghouse and an additional 2 hours to assemble each treated lumber doghouse. The company dedicates 30 hours every week towards assembling and paining dog houses.
Equation 2- ![x+2y=30](https://tex.z-dn.net/?f=x%2B2y%3D30)
→When we solve these equation we get the number of vinyl doghouse and treated lumber doghouse.
Subtract equation 2 from equation 1
![5x+2y-x-2y=50-30](https://tex.z-dn.net/?f=5x%2B2y-x-2y%3D50-30)
![4x=20](https://tex.z-dn.net/?f=4x%3D20)
![x=\frac{20}{4}](https://tex.z-dn.net/?f=x%3D%5Cfrac%7B20%7D%7B4%7D)
![x=5](https://tex.z-dn.net/?f=x%3D5)
Put value of x in equation 2
![x+2y=30](https://tex.z-dn.net/?f=x%2B2y%3D30)
![5+2y=30](https://tex.z-dn.net/?f=5%2B2y%3D30)
![2y=25](https://tex.z-dn.net/?f=2y%3D25)
![y=\frac{25}{2}](https://tex.z-dn.net/?f=y%3D%5Cfrac%7B25%7D%7B2%7D)
![y=12.5](https://tex.z-dn.net/?f=y%3D12.5)
Therefore, number of vinyl doghouse = 5, number of treated lumber doghouse =12.5
Answer:b
Step-by-step explanation:
Answer:
Step-by-step explanation:
I think it's a or b
Answer:
A.
Step-by-step explanation:
Answer:
![\left[\begin{array}{ccc}3&-1&\\-1&1/2\\\end{array}\right]](https://tex.z-dn.net/?f=%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D3%26-1%26%5C%5C-1%261%2F2%5C%5C%5Cend%7Barray%7D%5Cright%5D)
Step-by-step explanation:
The matrix system for the linear equations: x + 2y = 8, 2x + 6y = 9
![\left[\begin{array}{ccc}1&2&\\2&6\\\end{array}\right] \left[\begin{array}{ccc}x\\y\end{array}\right] = \left[\begin{array}{ccc}8\\9\end{array}\right]](https://tex.z-dn.net/?f=%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D1%262%26%5C%5C2%266%5C%5C%5Cend%7Barray%7D%5Cright%5D%20%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7Dx%5C%5Cy%5Cend%7Barray%7D%5Cright%5D%20%3D%20%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D8%5C%5C9%5Cend%7Barray%7D%5Cright%5D)
To get the coefficient of x and y, the inverse of the first matrix (let the first matrix be A) must be known.
= (1 / determinant of A) x Adjoint of A
the determinant of A = (1 x 6) - (2 x 2) = 6 - 4 = 2
Adjoint of A = ![\left[\begin{array}{ccc}6&-2&\\-2&1\\\end{array}\right]](https://tex.z-dn.net/?f=%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D6%26-2%26%5C%5C-2%261%5C%5C%5Cend%7Barray%7D%5Cright%5D)
=
= ![\left[\begin{array}{ccc}3&-1&\\-1&1/2\\\end{array}\right]](https://tex.z-dn.net/?f=%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D3%26-1%26%5C%5C-1%261%2F2%5C%5C%5Cend%7Barray%7D%5Cright%5D)