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jeka94
3 years ago
14

Area is 20 square units. the length is 4 more than 3 time the width. find the dimension

Mathematics
2 answers:
Andreyy893 years ago
8 0

starts with 20 smthing x3 +4 =  20 but what is it ???? hmmmm if you think more you can fiqure it out by just finding random numbers so use ur brain i guess???

dezoksy [38]3 years ago
4 0

Answer:

width: 2

length: 10

Step-by-step explanation:

L = 3W + 4

A = LW = (3W + 4) x W

  = 3w² +4w

3w² + 4w = 20

3w² + 4w -20 = 0

(w - 2) (3w + 10) = 0

w = 2 or w = - 10/3     (width is positive)  ∴ width = 2

length = 3 x 2 + 4 = 10

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So first one
'how many solutions does 2x-y=-5 and 2x+y=5 have?'
add and get
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plus
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equals
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x=0 always
solve for y
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the solution is (0,5)
only <u>ONE </u>solution






one way is to subsitute
just remember that it is in (x,y) form so
the pont (1,2) means that 1 solution is x=1 and y=2 so subsitute and find that
the first one is the answer you are correct





just look at the graph
the solution is the intersection
it seems to be at a point that is 3 units to the right and -6 units up (6 units down)
so the solution is (3,-6)
yo are corect








subsitution
y=y
therefor
the answe ris (-4,-14) if you did the math correctly











#8 is correct

# 9 is correct




# 10 the answe ris bananas=0.40 pears=0.60


the  last one you got it wrong, remember to check your answer to the graph for commonsense
then answer is (-2,5) and (1,2)
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