2x -3 = 0.4x +3.4
and this one
3x -2(x-3) = 15
2007-06-27 12:08:03 · 3 answers · asked by lushay 2 in Science & Mathematics ➔ Mathematics
2x - 3 = 0.4x + 3.4
2x - 3 (-0.4x) = 0.4x + 3.4 (-0.4x)
1.6x - 3 = 3.4
1.6x - 3 (+3) = 3.4 (+3)
1.6x = 6.4
1.6x/1.6 = 6.4/1.6
x = 4
3x - 2(x - 3) = 15
3x -2x + 6 = 15
x + 6 = 15
x + 6 (-6) = 15 (-6)
x = 9
2007-06-27 12:14:08 · answer #1 · answered by Runa 7 · 0⤊ 0⤋
2x - 0.4x = 3 + 3.4
1.6x = 6.4
x = 4
3x-2x+6 = 15
x = 9
2007-06-27 19:11:03 · answer #2 · answered by mataharu 2 · 1⤊ 0⤋
1. isolate the variable putting x's on one side, and all the others on the other side.
1.4x=6.4
divide by 1.4 on both sides, and you get the answer
2. distributive property
3x-2x-6=15
x+6=15
x=9
2007-06-27 19:14:22 · answer #3 · answered by JaxJagsFan 7 · 1⤊ 0⤋