Find the determinants, Dx, and Dy given: {3x-y=7 , -5x+4y=-2}

Dx=
| 7 -1|
|-2 4|
which is equal to
Dx=7*4-(-2)(-1)=28-2=26

Dy=
| 3 7 |
|-5 -2|
which is equal to
Dy=(3)(-2)-(-5)(7)=-6+35=29