solve by cross multiplication: 3x+y=13 and x-3y+9=0
Answers
Answered by
1
Answer:
3x+y=13 ----(1)
x-3y= -9 -----(2)
multiply equ^n 1 by 2 and equ^n 2 by 6
6x+2y=26
6x-18y= -54 change sign
- + +
20y= 80
y= 4
put the value of y = 4 in equation 1
3x+4= 13
3x = 13-4
3x = 9
x = 3
Similar questions