Math Is Fun Forum
Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °
You are not logged in.
- Topics: Active | Unanswered
Pages: 1
#1 2009-03-17 06:57:20
- GeeGee
- Member
- Registered: 2008-09-27
- Posts: 7
Help i have a test
Can you please tell me what this i about?
Here is one that the teacher put on the board:
7×[X+11 = X×10-10 ITU
7x+77 = 10x-10 1-7x
77 = 3x-10 1+10
87 = 3x 1:3
29 = x
and here are some of my other questions [ that we must do in the same way]
1) 15x + 3x - 6x = 96
2) 8z + 2 = 90
3) 7w ≤ 49
thank you, from
GeeGee
Offline
#2 2009-03-18 06:20:42
- Devantè
- Real Member
- Registered: 2006-07-14
- Posts: 6,400
Re: Help i have a test
1) Collect like terms;
12x = 96
Divide both sides by 12;
x = 96/12
x = 8
2) Subtract the two from both sides;
8z = 92
Divide both sides by 8;
z = 11.5
3) Divide 7 into 49 and you get 7, so;
w ≤ 7
So w is any value from negative infinity to 7
Offline
Pages: 1