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lukranit [14]
3 years ago
9

Substitute x = 5 into the expression (-2)x + 6. Do you get -4? Substitute x = -1 into the expression (-2)x + 6. Do you get - 4 W

hich method gives the correct answer ?
Mathematics
1 answer:
8090 [49]3 years ago
7 0

Answer:The first method, by substituting  5 into the expression   (-2)x + 6 gives the coreect answer of   -4

Step-by-step explanation:

Ist method

Substituting  x = 5 into the expression   (-2)x + 6,  we have

 (-2) 5 + 6,

=-10 + 6

=-4

2nd method

Substitute x = -1 into the expression (-2)x + 6,we have

(-2)(-1) + 6

2  +6=10

The first method, by substituting  5 into the expression   (-2)x + 6 gives the coreect answer of   -4

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A flat rectangular piece of aluminum has a perimeter of 62 inches. The length is 15
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Answer:

So, the required width of rectangular piece of aluminium is 8 inches

Step-by-step explanation:

We are given:

Perimeter of rectangular piece of aluminium = 62 inches

Let width of rectangular piece of aluminium = w

and length of rectangular piece of aluminium  = w+15

We need to find width i.e value of x

The formula for finding perimeter of rectangle is: Perimeter=2(Length+Width)\\

Now, Putting values in formula for finding Width w:

Perimeter=2(Length+Width)\\\\62=2(w+15+w)\\62=2(2w+15)\\62=4w+30\\62-30=4w\\4w=32\\w=\frac{32}{4}\\w=8

After solving we get the width of rectangular piece :w = 8

So, the required width of rectangular piece of aluminium is 8 inches

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