Question

1.5x+3.6y=2.1,2.5(x+1)=6y​

Answer 1

Answer:

Step-by-step explanation : 1.5x + 3.6y=2.1(let this be equation <1>)

=15x+36y=21  (multiplying 10 to whole equation)

=2.5(x+1)=6y

=2.5x+2.5=6y(let this be equation <2>)

=25x+25=60y (multiplying 10 to whole equation)

25x-60y= -25

75x-180y= -75 (multiplying equation <2>by 3)- <2>

75x+180y=105 (multiplying equation <1>by 5)- <1>

ADDING EQUATION <1> & <2>

75x-180y+75x+180y= -75+105

150x=30

x=0.2

15x+36y=21

15(0.2)+36y=21

36y=21-3

y=18/36

y=0.5