Bantuin dong yang tauu

Bantuin dong yang tauu

Jawab:

Penjelasan dengan langkah-langkah:

3x – 2y = 7

4x + 3y = 53

a. matriks koefisien

$left[begin{array}{ccc}3&-2\4&3end{array}right]. left[begin{array}{ccc}x\yend{array}right ] = left[begin{array}{ccc}-7\53end{array}right ]$

b. dengan determinan

$sf D =left|begin{array}{ccc}3&-2\4&3end{array}right | = 9+8 = 17\\DX= left|begin{array}{ccc}-7&-2\53&3end{array}right | = -21+ 106 = 85\\DY= left|begin{array}{ccc}3&-7\4&53end{array}right | = 159+28 = 187\\X =frac{DX}{D} = frac{85}{17} = 5\\Y =frac{DY}{D} = frac{187}{17} = 11$