Question

Solve :- 5x+3y=12 and 2x-y=7​

Answer 1

Answer:

x=3

and, y=-1

Step-by-step explanation:

5x+3y=12..............eqn1

2x-y=7.................eqn2

multiply equation one with 1 and equation two with 3

(5x+3y=12)1

(2x-y=7)3

Now,

5x+3y=12.........eqn1

6x-3y=21..........eqn2

Now,

add eqn2 by eqn 1 we get,

11x=33

so,x=33/11

x=3

Now,

substitute x in eqn 2

2x-y=7

2*3-y=7

-y=7-6

so,y=-1

I hope it is helpful for you

Answer 2

Step-by-step explanation:

5x+3y=12. .........1

2x-y=7. .........2

from 1st equation

5x+3y=12

x=12-3y/5. .........3

put value of equation 3 in 2nd equation

2(12-3y/5)-y=7

(24-6y/5)-y=7

-24y+6y^2=35

6y^2-24y-35=0

y=b^2-4ac

=(24)^2-4×6×35

=576-840

=-264. .........4

put 4 in 1

5x+3(-264)=12

5x=12-792

x=780/5

x=156

hope it hepls u follow mark my answer as brainlies