show your work and check
2007-03-10 12:21:36 · 8 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
-35x+10+35x-21=x-7
-11=x-7
-4=x
2007-03-10 12:26:11 · answer #1 · answered by leo 6 · 0⤊ 0⤋
Here it is in gory detail:
-5(7x-2) + 7(5x -3) = x-7
-35x + 10 +35x - 21 = x -7
10 - 21 = x - 7
10 - 21 + 7 = x
-4 = x
And here's the check you asked for:
-5(7(-4) - 2) + 7(5(-4) -3) = -4 -7
-5(-28 - 2) + 7(-20 - 3) = -11
-5(-30) + 7(-23) = -11
150 - 161 = -11
-11 = -11
check!
2007-03-10 12:31:07 · answer #2 · answered by Dave R 6 · 0⤊ 0⤋
Answer:
-5(7x-2)+7(5x-3)=x-7
-35x+10+35x-21=x-7
10-21=x-7
-11+7 =x
x= -4
Checking:
-5 [ 7(-4) - 2 ] + 7 [5(-4) -3] = -4-7
-5(-28-2) + 7(-20-3) =-11
-5(-30) + 7(-23) = -11
150 - 161 = -11
-11 = -11
Therefore, x = -4
2007-03-10 16:09:43 · answer #3 · answered by ash 2 · 0⤊ 0⤋
-5(7x-2)+7(5x-3)=x-7
-35x+10 +35x-21 =x-7
-11=x-7
x=-4
2007-03-10 12:29:14 · answer #4 · answered by jaybee 4 · 0⤊ 0⤋
-35x +10 +35x -21 = x - 7 (opening out brackets)
10 - 21 = x - 7 (35x -35x cancells terms out)
10 -21 +7 = x (move -7 to other side, making it +7)
so x = -4
to check reinsert x=-4 into origonal eqn as so.
(-35x-4)+10 +(35x-4)-21 = -4 -7
10-21=-4-7 (both x terms on L.H.S cancell out as before)
-11=-11
as both sides of the eqn are equal to -11, this confirms that
x= -4
2007-03-10 12:38:37 · answer #5 · answered by fifs_c 3 · 0⤊ 0⤋
You were close, it truly is 6.5 (1/2 of your answer) Multiply out the brackets to get 3x + 6 = 5x - 7 upload 7 to both aspect: 3x+13=5x eliminate 3x from both aspect 13=2x Divide both aspect by technique of two 13/2=x x=6.5
2016-12-01 19:37:16 · answer #6 · answered by ? 4 · 0⤊ 0⤋
x=-4
2007-03-10 12:29:49 · answer #7 · answered by Anonymous · 0⤊ 0⤋
this might be wrong but i just did it and i think it is 15
2007-03-10 12:31:18 · answer #8 · answered by syd 1 · 0⤊ 0⤋