26 - (18/3) + (9/9) = 26 - 6 + 1 = 21
18
-16
4y + 3 = 7y - 18Add 18 to each side of the equation:4y + 21 = 7ySubtract 4y from each side:21 = 3yDivide each side by 3:7 = y
Commutativity or Abelian property
n + 13 = 21. n = 21 - 13
15
-18
21
12
18
-16
Commutativity or Abelian property
n + 13 = 21. n = 21 - 13
4y + 3 = 7y - 18Add 18 to each side of the equation:4y + 21 = 7ySubtract 4y from each side:21 = 3yDivide each side by 3:7 = y
3, 7, 21. 3x7 is the only equation that equals 21, and so these are the only factors of 21.
32
y = 6/7x+3 General form of the line equation: 6x -7y+21 = 0