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balandron [24]
3 years ago
12

I need help with (e) please

Mathematics
2 answers:
Gwar [14]3 years ago
7 0
I am 100% sure that the answer to (e) is -8+w
Lyrx [107]3 years ago
5 0
8(w-1)-7w
(8w-8)-7w
W-7w
-7w < the answer
I think
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Answer:

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Which equation is true when the value of x is -12
Sophie [7]

Answer:

Which equation is true when the value of x is -12    HERE YOU GO!!

Step-by-step explanation:

tricky ... let's see ...

I notice that if we subtract xy from both sides we get

7x + xy - xy = xy - xy + 21

then

7x = 21

and

x = 21/7 = 3

so there is only one value of x that satisfies the equation

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Going back to the original equation we see that any value of y will satisfy the original equation

we can see this by rearranging things:

7x + xy - xy = 21

here, I have performed the subtraction of xy on the right side as above, but have left the left side undone

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Note that the above can also be written as

7x + (x - x)y = 21

or

7x + 0y =21

now, since anything times zero equals zero,

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Let's summarize:

1) x = 3

2) y = anything

looking back at the original question;

1) the equation is true for all ordered pairs

FALSE (only one x works, not all x)

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FALSE (x=3, y=anything) makes it true, i.e. (3,1)  

3) For each value of x, there is one and only one value of y that makes the equation true,

FALSE for each value of x, for the one value of x, x=3, y can be any number, which is an infinite number, not one

4) for each value of y, there is one and only on value of x that makes the equation true.

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ANSWER: STATEMENT 4 is CORRECT (TRUE)

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Step-by-step explanation:

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= 17

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STEP-BY-STEP-EXPLANATION

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Step-by-step explanation:

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