2000018304

SubArea: 
Matrices and determinants
Level: 
B
Project ID: 
2000018304
Accepted: 
0
Clonable: 
0
Easy: 
1
Which matrices X and Y make valid both equalities given below? \[ 2X+Y = \left (\array{ 1 &4\cr 2 & 0\cr } \right ) \] \[ X-Y = \left (\array{ 1 &-1\cr 1 & 0\cr } \right ) \]
\( X = \left (\array{ \frac23 &1\cr 1 & 0\cr } \right ) \) and \( Y = \left (\array{ -\frac13 &2\cr 0& 0\cr } \right ) \)
\( X = \left (\array{ \frac23 &1\cr 1 & 0\cr } \right ) \) and \( Y = \left (\array{ -\frac13 &4\cr 0& 0\cr } \right ) \)
\( X = \left (\array{ \frac23 &1\cr 1 & 0\cr } \right ) \) and \( Y = \left (\array{ \frac13 &2\cr 0& 0\cr } \right ) \)
\( X = \left (\array{ \frac23 &1\cr 1 & 1\cr } \right ) \) and \( Y = \left (\array{ -\frac13 &4\cr 0& 0\cr } \right ) \)