1.7(x-1) = 3x + 9
2.3y-(y - 1) = 5y +2
3.2b + 0.9 = 0.3b +6
thanx
2007-06-26 05:45:38 · 3 answers · asked by brittney_lovely 1 in Science & Mathematics ➔ Mathematics
Equation 1
7(x - 1) = 3x + 9
7x - 7 = 3x + 9
7x - 7 - 3x = 3x + 9 - 3x
4x - 7 = 9
4x - 7 + 7 = 9 + 7
4x = 16
4x / 4 = 16 / 4
x = 16 / 4
x = 4
- - - - - - - - -
Equation 2
3y - (y - 1) = 5y + 2
3y - y + 1 = 5y + 2
2y + 1 = 5y + 2
2y + 1 - 2y = 5y + 2 - 2y
1 = 3y + 2
1 - 2 = 3y + 2 - 2
- 1 = 3y
- 1 / 3 = 3y / 3
- 1 / 3 = y
- - - - - - - -s-
2007-06-26 06:38:04 · answer #1 · answered by SAMUEL D 7 · 1⤊ 0⤋
Solve for the variable:
1. 7x - 7 = 3x + 9
4x = 16
x = 4
2. 3y - y + 1 = 5y + 2
2y + 1 = 5y + 2
-3y = 1
y = -1/3
3. 2b + 0.9 = 0.3b + 6
1.7b = 5.1
b = 3
2007-06-26 12:52:09 · answer #2 · answered by Dave 6 · 0⤊ 0⤋
7(x-1) = 3x + 9
7x-7=3x+9
7x -3x=9+7
4x=16
x=4
3y-(y - 1) = 5y +2
3y -y +1=5y+2
3y -y -5y=2 -1
-3y=1
y=-1/3
2b + 0.9 = 0.3b +6
2b - 0.3b=6 - 0.9
1.7b=5.1
b= 3
2007-06-26 12:59:54 · answer #3 · answered by fofo m 3 · 0⤊ 0⤋