If the equation is an identity or if it has no solution, write identity or no solution. solve each equation.
1. 3x=27-15x
2. 39c+78=33c
3. 7(2-m)=3m
2007-07-16 11:48:53 · 3 answers · asked by ☮ 4 in Science & Mathematics ➔ Mathematics
1. 3x = 27 - 15x
x = (27 - 15x) / 3
x = 9 - 5x
5x + x = 9
6x = 9
x = 9/6
x = 1.5 Answer
2. 39c + 78 = 33c
6c = 78
c = 78/6
c = 13 Answer
3. 7(2 - m) = 3m
14 - 7m = 3m
14 = 7m + 3m
14 = 10m
14/10 = m
m = 7/5 or 1 2/7 Answer
2007-07-20 07:34:34 · answer #1 · answered by Jun Agruda 7 · 2⤊ 0⤋
Hello
1. add 15x to both sides giving us
18x = 27 so x = 18/27 = 2/3
2. subtract 39c from both sides and we have 78 = -6c so c = -13
3. multiply out giving us 14 - 7m = 3m add 7m to both sides we have 14 = 10m so m = 14/10 = 7/5
Hope This Helps!
2007-07-16 11:54:56 · answer #2 · answered by CipherMan 5 · 0⤊ 1⤋
1. 18x = 27, x = 27/18 = 1.5
2. 78 = -6c, c = -78/6 = -13
3. 14 - 7m = 3m, or 14 = 10m, m = 1.4
2007-07-16 11:54:11 · answer #3 · answered by John V 6 · 0⤊ 0⤋