3a = 21
Therefore, a = 21/3
a = 7
3a - 7 = -28 Therefore, 3a = -21 a = -21/3 Therefore, a = -7
-21 = 9a - 15 - 3a -6 = 6a -1 = a
a = 3
9a+21 3(3a+7)
depends what 'a' =
y = (3 X 8) - 5 = 21.
3a=1divide both sides by 3a=1/3
-3a-12 = 12+12 +12-3a = +12~ ~-3 -3a = -8
3a = 1a = 1/3 (a third)
a = -5
If a + b = 6, what is the value of 3a + 3b?
P = 3a - 3q Add 3q to each side: P + 3q = 3a Double each side: 6a = 2P + 6q