Solve 3x + 2y + 11 = 0; 7x - 4y = 9 by Cramer's rule.
Answers
Answered by
2
3 x + 2 y + 11 = 0 ; 7 x = 4y = 9
3x + 2y + 11 = 0
3x + 2y = - 11
3x - 2y = - 11
x = - 2 / 3 y - 11 / 3
7 ( - 2 / 3 y - 11 / 3 ) - 4y = 9
- 14 / 3 y - 77 / 3 - 4y = 9
- 26 / 3 y - 77 / 3 = 9
- 26 / 3 y = 104 / 3
y = - 4
x = - 2 / 3 ( - 4 ) - 11 / 3
x = 8 - 11 / 3
x = - 1
x = - 1 , y = - 4
Similar questions