3a + 15 = 4a
Subtract 3a from both sides
15 = a
So a is 15.
depends what 'a' =
If a + b = 6, what is the value of 3a + 3b?
Subtract 6 from each side: 3a = 9Divide each side by 3: a = 3Job done.
a + a + a - 2a = 3a - 2a = a
a = 3
depends what 'a' =
If a + b = 6, what is the value of 3a + 3b?
a = -5
Subtract 6 from each side: 3a = 9Divide each side by 3: a = 3Job done.
2a + 3a + 4 = 5a + 4
a + 3a + 5a = 180 9a =180 a = 20
1
a + a + a - 2a = 3a - 2a = a
If: -3a-1 = -15 Then: a = 4 and 2/3
a = 20
a = 3
-21 = 9a - 15 - 3a -6 = 6a -1 = a