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Alex777 [14]
3 years ago
7

The width of a rectangle is 8 units less than the length. The area of the rectangle is 9 units. What is the length, in units, of

the rectangle?
Mathematics
1 answer:
Kipish [7]3 years ago
8 0
W=l-8
a=9
a=lw
9=(l-8)l
9=l²-8l
0=l²-8l-9
factor
0=(l-9)(l+1)
set to zero
l-9=0
l=9
l+1=0
l=-1, false length can't be negative


l=9
the length is 9 units long
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6 0
3 years ago
4/y+2 - 9/y-2 = 9/y^2-4
Evgesh-ka [11]
Going off the idea that this is 4/(y+2) - 9/(y-2) = 9/(y^2-4), let's first rewrite y^2-4 in the form of a^2-b^2, where a=y and b=2.
y/(y+2)-9/(y-2)=9/(y^2-2^2)
Now, use difference of squares: a^2-b^2=(a+b)(a-b)
4/(y+2)-9/(y-2)=9/((y+2)(y-2))
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Then keep on simplifying until you get your answer
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8 0
3 years ago
Read 2 more answers
Write an equation for the line that is parallel to the given line and that passes through the given point. y = 1/2x - 8; (-6, -1
Allisa [31]

Answer:

y = 1/2x - 14

Step-by-step explanation:

Parallel lines have the same gradient

So,

gradient for second line = gradient of the first line = 1/2

Also,

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So, we can find the y-intercept by substitution

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So,

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6 0
2 years ago
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zaharov [31]

Answer:

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5 0
3 years ago
Read 2 more answers
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