Question

7x + 3y = 15 ; 12y - 5x = 39​

Answer 1

Answer:

let 7x+3y=15 be EQ 1

and

-5x+12y=39 be EQ 2

multiply EQ 1 by 4:

28x+12y=60

-5x+12y=39

+ - -

--------------------

23x=21

x=21/23

put x=21/23 in 2 EQ :

-5*(21/23)+12y=39

-105/23+12y=39

12y=39+105/23

12y=1002

y=1002/12

y=501/6

Step-by-step explanation:

we have used method of elimination to solve x and y.