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Darya [45]
3 years ago
9

What two numbers multiply to 18 but add to get -5?

Mathematics
1 answer:
ollegr [7]3 years ago
3 0
So this one has to be two negative numbers to get a positive number. so then you can think of what multipys to 18
-9*-2 wont work because -9+-2 gets you -11
-6*-3 wont work because -6+-3 gets negative nine
i dont think there is one honestly. ive sat here and tried them all
2 and 9 6 and 3 and 18 and 1 
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Answer:

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Step-by-step explanation:

Let 1/x  = a &

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So, now the equation:

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To eliminate a, Multiply equation (i) by 5 and multiply (ii) by (-2)

(i)*5             10a  + 15b = 65

(ii)*(-2)    <u>    - 10a + 8b  = 4</u>      ( Now add, a will be eliminated}

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Plug in the value of b in equation (i)

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2a  = 13 - 9

2a = 4

a= 4/2

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Now a = 1/x   ------>x = 1/a = 1/2

b = 1/y ----------->y = 1/b = 1/3

x+y=\frac{1}{2}+\frac{1}{3}\\\\=\frac{1*3}{2*3}+\frac{1*2}{3*2}\\\\=\frac{3}{6}+\frac{2}{6}\\\\=\frac{5}{6}

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Step-by-step explanation:

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Step-by-step explanation:

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