Question

Tentukan penyelesaian persamaan

1. 2r + 3 = r+ 7
2. 3w - 2 = 2w - 5
3 8y + 15 = 7y + 5

Answer 1

1. 2r-r=7-3
       r=4
2. 3w-2w=-5+2
          w=-3
3. 8y-7y=5-15
          y=-10

Answer 2

2r + 3 = r + 7
  2r - r = 7 - 3
        r = 4

Himpunan Penyelesaian = {4}



   3w - 2 = 2w - 5
3w - 2w = 5 + 2
         w = 7

Himpunan Penyelesaian = {7}


8y + 15 = 7y + 5
 8y - 7y = 5 - 15
          y = -10

Himpunan Penyelesaian = {-10}