how do you solve this ?
• 6a - 7 = 4a + 9 ?
• -14 - n = -3n + 6 ?
oh and can you explain it step by step thanks (:
6a - 4a - 7 = + 9
2a = 9 + 7
2a = 16
2a/2 = 16/2
a = 8
btw when + goes over the = it becomes -
And - becomes +
-14 -n + 3n = 6
2n = 6 + 14
2n = 20
n = 10
the first problem:
(6a - 4a) = (9 + 7) ---- get all the variables on one side and the numbers on the other.
(16/2) = 8 ---- undo the multiplication by doing the opposite [division]
the second problem:
-14 - n= -3n + 6
-n + 3n = 6 + 14
1. 6a-4a=9+7,so
2a=16,so
a=8
2.-n+3n=6+14, so
2n=20, so
n=10
Comments
6a - 4a - 7 = + 9
2a = 9 + 7
2a = 16
2a/2 = 16/2
a = 8
btw when + goes over the = it becomes -
And - becomes +
-14 -n + 3n = 6
2n = 6 + 14
2n = 20
n = 10
the first problem:
(6a - 4a) = (9 + 7) ---- get all the variables on one side and the numbers on the other.
2a = 16
(16/2) = 8 ---- undo the multiplication by doing the opposite [division]
a = 8
the second problem:
-14 - n= -3n + 6
-n + 3n = 6 + 14
2n = 20
n = 10
1. 6a-4a=9+7,so
2a=16,so
a=8
2.-n+3n=6+14, so
2n=20, so
n=10