Question

Solve by elimination.


5x + y = 5

9x - 4y = -20

Answer 1

x = 0

y = 5

Answer 2

THANKS

Answer 3

u can also use x=A^(-1)b
where A^(-1) is the inverse of the coefficient matrix

or row reduce
[5 1 5]
[9 -4 -20]

4R+R2->R2 replace row 2 with 4*row 1+ row 2

[5 1 5]
[0 -29/5 -29]

y = 5
5x + y = 5 => 5x = 0
x = 0