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originnjoku3632
23.09.2019 •
Mathematics
Solve the system by using a matrix equation
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Ответ:
Option A is correct (17,11).
Step-by-step explanation:
6x - 9y = 3
3x - 4y =7
it can be represented in matrix form as![\left[\begin{array}{cc}6&-9\\3&4\end{array}\right] \left[\begin{array}{c}x\\y\end{array}\right] = \left[\begin{array}{c}3\\7\end{array}\right]](/tpl/images/0254/6003/f38e7.png)
A=![\left[\begin{array}{cc}6&-9\\3&4\end{array}\right]](/tpl/images/0254/6003/84c2f.png)
X=![\left[\begin{array}{c}x\\y\end{array}\right]](/tpl/images/0254/6003/7de5a.png)
B=![\left[\begin{array}{c}3\\7\end{array}\right]](/tpl/images/0254/6003/d7fe0.png)
i.e, AX=B
or X= A⁻¹ B
A⁻¹ = 1/|A| * Adj A
determinant of A = |A|= (6*-4) - (-9*3)
= (-24)-(-27)
= (-24) + 27 = 3
so, |A| = 3
Adj A=![\left[\begin{array}{cc}-4&9\\-3&6\end{array}\right]](/tpl/images/0254/6003/fe843.png)
A⁻¹ =
/3
A⁻¹ =![\left[\begin{array}{cc}-4/3&3\\-1&2\end{array}\right]](/tpl/images/0254/6003/8023e.png)
X= A⁻¹ B
X=![\left[\begin{array}{cc}-4/3&3\\-1&2\end{array}\right] *\left[\begin{array}{c}3\\7\end{array}\right]](/tpl/images/0254/6003/a8584.png)
X=![\left[\begin{array}{c}(-4/3*3) + (3*7)\\(-1*3) + (2*7)\end{array}\right]](/tpl/images/0254/6003/97986.png)
X=![\left[\begin{array}{c}-4+21\\-3+14\end{array}\right]](/tpl/images/0254/6003/ae122.png)
X=![\left[\begin{array}{c}17\\11\end{array}\right]](/tpl/images/0254/6003/83e24.png)
x= 17, y= 11
solution set= (17,11).
Ответ:
a. (17,11)
Step-by-step explanation:
The given system is ;
The augmented matrices is
Divide Row 1 by 6
Subtract 3 times Row 1 from Row 2
Divide Row 2 by![\frac{1}{2}](/tpl/images/0254/6003/9cdae.png)
Add
times Row 2 to Row 1
Hence the solution is (17,11)
Ответ: