Question

3x+4y=25,5x-6y=-9 solve with substitution method​

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