Answers:
1) 2/5
2) 2/3
3) 3/2
4) 5/2
2006-11-27 14:17:27 · 9 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
4) 5/2 b/c:
1) 84 = -(-42x+21) cross multiply
2) 84 = 42x-21 distribute the negative.
3) 84 + 21= 42x -21+21 add 21 to each side
4) 105 = 42x
5) x = 2.5 or 5/2 divide each side by 42
2006-11-27 14:21:19 · answer #1 · answered by Gardenia 6 · 0⤊ 0⤋
12=-1/7(-42x+21)
12=-1/7(-42x)+-1/7(21) Multiply each in parenthesis by -1/7
12=6x-3
12+3=6x-3+3 Add 3 to both sides
15=6x
15/6=6x/6 Divide by 6 on both sides to get x
x=15/6 Simplify the fraction
x=5/2 Final Solution
2006-11-27 14:26:21 · answer #2 · answered by Hawk 2 · 0⤊ 0⤋
3
2006-11-27 14:19:48 · answer #3 · answered by Poptart20 2 · 0⤊ 2⤋
4. x=5/2
2006-11-27 14:28:33 · answer #4 · answered by PrInCeSs 2 · 0⤊ 0⤋
12 = -1/7(-42x + 21)
12= 6x - 3
+3 +3
15 = 6x
6/6x = 15/6
x = 15/6
2006-11-27 14:22:48 · answer #5 · answered by Anonymous · 1⤊ 0⤋
I have been given x = -19 right here is my artwork: 12 = -a million/7(-42x + 21) *Multiply the two sides via -7.* -eighty 4 = (-42x + 21) *Divide the two sides via -40 two.* 2 = (x + 21) *Subtract 21 from the two sides.* -19 = x x = -19
2016-12-14 07:51:32 · answer #6 · answered by ? 4 · 0⤊ 0⤋
the answer is D
12(-7) - 21 = -42X
X = (-84-21) / -42
x = 5/2
2006-11-27 14:22:31 · answer #7 · answered by Anonymous · 1⤊ 0⤋
12=6x-3 -> 15=6x -> x=5/2
choice 4
2006-11-27 14:20:37 · answer #8 · answered by Dan 3 · 1⤊ 0⤋
the answer is choice number 4...
2006-11-27 14:24:38 · answer #9 · answered by keig 2 · 1⤊ 0⤋