what the answer to this 3 - 5y ≥ 19 - 3y?
回答 (10)
2009-06-11 2:46 pm
✔ 最佳答案
3 - 5y ≥ 19 - 3y-5y+3y ≥19-3
-2y ≥16
y≤-8
2009-06-15 6:59 pm
- 16 ≥ 2 y
y ≤ - 8
y ≤ - 8
2009-06-11 2:55 pm
3 - 5y ≥ 19 - 3y
- 5y + 3y ≥ 19 - 3
-2y ≥ 16
.......16
y ≤ --------
.......-2
y ≤ -8
- 5y + 3y ≥ 19 - 3
-2y ≥ 16
.......16
y ≤ --------
.......-2
y ≤ -8
2009-06-11 2:51 pm
y ≤ -8
2009-06-11 2:47 pm
you act as if the > is an = sign and do the same steps
3 - 5y ≥ 19 - 3y
subtract -5y from both sides
3 ≥ 19 + 2y
subtract 19 from both sides
-16 ≥ 2y
divide by 2
-8 ≥ y
3 - 5y ≥ 19 - 3y
subtract -5y from both sides
3 ≥ 19 + 2y
subtract 19 from both sides
-16 ≥ 2y
divide by 2
-8 ≥ y
2009-06-11 2:37 pm
3 - 5y ≥ 19 - 3y
3y - 5y ≥ 19 - 3
-2y ≥ 16
y ≤ 16/(-2)
y ≤ -8
3y - 5y ≥ 19 - 3
-2y ≥ 16
y ≤ 16/(-2)
y ≤ -8
2009-06-11 2:36 pm
-y ≥ 8
2009-06-11 2:36 pm
5y + 3y ≥ 19 - 3
8y ≥ 16
y ≥ 2
y = {2, 3, 4, ....}
S = {2, 3, 4,.....}
8y ≥ 16
y ≥ 2
y = {2, 3, 4, ....}
S = {2, 3, 4,.....}
2009-06-11 2:36 pm
3 - 5y ≥ 19 - 3y
-2y ≥ 16
-8≥ y
-2y ≥ 16
-8≥ y
2009-06-11 2:35 pm
re-arrange as usual . . .but reverse the inequality sign
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