Question

1)y-4/7y=4,2 2) x-7/9x=3,6

Answer 1

1) 7/7y-4/7y=4.2

3/7y=4.2

y=4.2 : 3/7

y=9,8

 

2)

9/9x - 7/9x=3.6

2/9x=3,6

х=16,2

Answer 2

1) y - 4y/7 = 21/5

    (7y - 4y)/7=21/5 

    3y*5=7*21

    y=49/5

 

2) x-7x/9 = 18/5

    (9x - 7x) / 9=18/5

    2x * 5=18 * 9

    x=81/5