Question

solve plz by elimination method 4x+9y=30xy and 5y - 3x = xy​

Answer 1

Answer: 4x+9y=30xy------1

5y-3x=xy-----------2

Step-by-step explanation:multiplying eqyuation 2 by 4 and equation 1 by 3

Thus we get the equations

12x+27y=90xy

20y-12x=4xy

On adding these equations we get

12x+27y=90xy

-12x+9y=4xy

Thus on adding we get 0+36y=94xy

Thus 36y=94xy

y=94/36

y=47/18

Substituting y in equation 4x+9×47/18=30x47/18

4x+47/2=15×47/9

4x=709/9-47/2

4x=995/18

x=995/18×4

x=995/72