We can calculate the value of x by Cramer's rule by: O Dy / D O DZ/D Dx / D No one above The matrix which have same numbers of columns and rows is called : * Symmetric matrix Row matrix Column vector Square matrix Identity matrix is the matrix that: All elements equal 1 All elements equal o Diagonal element equal 1 No one above If A= [123] and B=[ 5 7 8 ], then A+B equal O [69 11] O [97 11] O [835] O [-6 9 11] * The value of D in determinant 1 |equal : O 1 -2 O 2 ! O o is the array that consist single column * Row Vector Row array Row matrix Column matrix The size of matrix which consist three columns and two rows can write at form : * 2x3 O 3x2 O 2x2 O 3x3 If x + y= 4 and 2x-y=3, then value of y equal: * O 1.67 O -1.67 O 2.67 O 3.67 Row matrix consists of single column. * True False In order to find three variables x, y, z. we need three equations. * True O False If 2x+y=1 and 3x+2y=2 the value of D equal o. True False To find the value of Dz. at first, we replace the number behind the equals instead of z column. * True False We can subtract two matrices if their size are not same. True False