In each of the following, if x>=6, write down an inequality to show the range of values of y. ( Show all steps)
a. y=4x
b. y=2x-5
c. y=-7x
d. y=-0.2(2-x)
Maths...... about inequality
2008-12-12 2:09 am
回答 (3)
2008-12-12 2:38 am
✔ 最佳答案
a.y=4xx=y/4
y/4>=6
y>=24
b.
y=2x-5
(y+5)/2=x
(y+5)/2>=6
y+5>=12
y=7
c.
y=-7x
x=-y/7
-y/7>=6
-y>=42
y<=-42
d.
y=-0.2(2-x)
y=(-2/10)(2-x)
-5y=2-x
x=2+5y
2+5y>=6
y>=4/5
參考: me
2008-12-12 5:31 pm
a. y = 4x
4x >= 4×6
y >= 24
b. y = 2x - 5
2x - 5 >= 2×6 - 5
2x - 5 >= 7
y >=7
c. y = -7x
-7x >= -7 × 6
-7x >= -42
y >= -42
d. y = -0.2(2-x)
-0.2(2-x) >= -0.2(2-6)
-0.2(2-x) >= 0.8
y >= 0.8
4x >= 4×6
y >= 24
b. y = 2x - 5
2x - 5 >= 2×6 - 5
2x - 5 >= 7
y >=7
c. y = -7x
-7x >= -7 × 6
-7x >= -42
y >= -42
d. y = -0.2(2-x)
-0.2(2-x) >= -0.2(2-6)
-0.2(2-x) >= 0.8
y >= 0.8
參考: me
2008-12-12 10:13 am
a.
y = 4x
y >= 4*6
y >= 24
b.
y = 2x-5
y >= 2*6-5
y >= 12-5
y = 7
c.
y = -7x
y >= -7*6
y >= -42
d.
y = -0.2(2-x)
y >= -0.2(2-6)
y >= -0.2*(-4)
y >= 0.8
y = 4x
y >= 4*6
y >= 24
b.
y = 2x-5
y >= 2*6-5
y >= 12-5
y = 7
c.
y = -7x
y >= -7*6
y >= -42
d.
y = -0.2(2-x)
y >= -0.2(2-6)
y >= -0.2*(-4)
y >= 0.8
參考: me
收錄日期: 2021-04-25 23:16:06
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