Question

7х + Зу = 15 , 12 y- 5х = 39​

Answer 1

Answer:

7x+3y= 15

3y= 15-7x

y= (15-7x)/3

by putting the value in equation 2

12y-5x= 39

12{(15-7x)/3}-5x= 39

4(15-7x)-5x= 39

60-28x-5x= 39

-33x= 39-60

-33x= -21

• x= -21/-33

x= 7/11.

by putting the value of x in equation 1.

7x+3y= 15

7(7/11)+3y= 15

49/11+3y= 15

3y= 15-49/11

3y= (165-49)/11

3y= 116/11

• y= 116/33

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