12a - 5b = 18
12a - 5b = 30
thanks
2007-07-22 07:18:44 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
12a - 5b = 18
12a - 5b = 30
As 12a-5b cant b equal to 18 and 30 both,
so these 2 equations hv no solution.
2007-07-22 07:21:23 · answer #1 · answered by sweet n simple 5 · 0⤊ 1⤋
The same equation can't have two different values!
If you meant
12a - 5b = 18
12a + 5b = 30
Adding them together,
24a = 48
a = 48/24 = 2
12x2 + 5b = 30
5b = 6
b = 6/5
2007-07-22 14:24:58 · answer #2 · answered by Swamy 7 · 1⤊ 0⤋
12a-5b=18,
12a-5b=30
subtracting,we get:
0=-12 which is impossible. so there is no solution.
2007-07-22 14:24:54 · answer #3 · answered by Anonymous · 0⤊ 1⤋
Subtract the columns, you already have like terms lined up. You get 0=-12. Since your method was correct, but the result is impossible, you can conclude that this set of equations does not have a solution or another way of saying the same thing is the solution is the empty set.
2007-07-22 14:25:40 · answer #4 · answered by kira 2 · 0⤊ 1⤋
If you add the two equations, it doesn't solve the problem. If you subtract the two equations, you get 0 = -12. Since this is impossible, there is no solution to the system of equations.
2007-07-22 14:22:30 · answer #5 · answered by S J 1 · 0⤊ 1⤋