Question

Solve by any suitable method 3x+4y=25;5x-6y=-9

Answer 1

3x+4y=25. equation one multiply by five
5x-6y=-9. equation two multiply by three

15x+20y=125
15x-18y=-27
_. +. +
38y= 152
y =152/38
y=4
substitute the value of y in equation 1
3x+4y=25
3x+4(4)=25
3x+16=25
3x=25-16
3x=9
x=9/3
x=3