Jawapan

2015-09-02T21:40:19+08:00
Soalan :
2x - 3y = 5 
4x - 7y = 1 

Jawapan :
( 2x - 3y = 5 ) x2 -> [ 2x x 2 ] [ 3y x 2 ] [ 5 x 2 ]
( 4x - 7y = 1 ) 

4x - 6y = 10
 -      -      -
4x - 7y = 1

-y = 9
-9 = y


Jawapan Paling Bijak!
2015-09-03T08:35:27+08:00
2x - 3y = 5
4x - 7y = 1

 \left[\begin{array}{ccc}2&-3\\4&-7\\\end{array}\right] \left[\begin{array}{ccc}x\\y\\\end{array}\right] = \left[\begin{array}{ccc}5\\1\\\end{array}\right]

\left[\begin{array}{ccc}x\\y\\\end{array}\right] = \frac{1}{2(-7) - (-3)(4)} \left[\begin{array}{ccc}-7&3\\-4&2\\\end{array}\right] \left[\begin{array}{ccc}5\\1\\\end{array}\right]

\left[\begin{array}{ccc}x\\y\\\end{array}\right] = \frac{1}{-14+12} \left[\begin{array}{ccc}-7(5)+&3(1)\\-4(5)+&2(1)\\\end{array}\right]

\left[\begin{array}{ccc}x\\y\\\end{array}\right] = \frac{1}{-2} \left[\begin{array}{ccc}-35&+3\\-20&+2\\\end{array}\right]

\left[\begin{array}{ccc}x\\y\\\end{array}\right] = \frac{1}{-2} \left[\begin{array}{ccc}-32\\-18\\\end{array}\right]

\left[\begin{array}{ccc}x\\y\\\end{array}\right] = \left[\begin{array}{ccc}16\\9\\\end{array}\right]

x = 16, y = 9
1 5 1