- 3a - 1 = - 15
add 1 to each side
- 3a = - 14
divide each side by - 3 ( dividing a negative by a negative leaves a positive #)
a = 14/3
check
- 3(14/3) - 1 = - 15
- 15 = - 15
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-21 = 9a - 15 - 3a -6 = 6a -1 = a
12
3a + 15 = 4a Subtract 3a from both sides 15 = a So a is 15.
3a-9 = 6 3a = 6+9 3a = 15 a = 15/3 a = 5 Substitute a = 5 into 4a-1. 4a-1 =4(5)-1 =20-1 =19 Therefore, the value of 4a-1 is 19.
3a = 1a = 1/3 (a third)