i've tried and tried and i really cant figure out how to do these please please could you help me by telling me the method on how to finding it and the answer
Thankyou so much!
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2007-09-17 06:10:40 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
Remember whatever you do - you must do the same to both sides of an equation - Becomes the well used term "Cross-Multiply"
27
Becomes: 9(2x + 1) = 7(x + 2)
Expand Both sides: 18x + 9 = 7x + 14
Collect terms: 11x = 5
So x = [5/11]
29
Becomes: 4(1 – x) = 2
Expand both sides: 4 – 4x = 2
Collect terms: 2 = 4x
So x = [1/2]
2007-09-17 06:57:44 · answer #1 · answered by Rod Mac 5 · 0⤊ 1⤋
9/(x + 2) = 7/(2x +1)
Multiply both sides by (x+2)
9 = 7(x + 2)/(2x + 1)
Multiply both sides by (2x + 1)
9(2x + 1) = 7(x + 2)
So: 18x + 9 = 7x + 14
Take 9 from both sides and 7x from both sides and you are left with:
11x = 5
x = 5/11 or 0.4545
The other one is even easier. Follow the same method and you should come up with 1/2 or 0.5.
2007-09-17 13:50:24 · answer #2 · answered by mustardcharlie 3 · 0⤊ 0⤋
ans27 11/5 ans29 0.5
2007-09-17 13:34:01 · answer #3 · answered by Goat Whacker 5 · 0⤊ 0⤋
the answer to number 29 is x= 0.5
2007-09-17 13:19:34 · answer #4 · answered by Smumph45 6 · 0⤊ 0⤋