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3 years ago

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

1 answer:

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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If 2/x+ 3/y =13 and 5/x- 4/y = -2, then x+y equals (a) 1/6 (b) -1/6 (c) 5/6 (d) -5/6

KonstantinChe [14]

Answer:

Step-by-step explanation:

Let 1/x = a &

1/y = b

So, now the equation:

2a +3b = 13 --------------------(i)

5a - 4b = -2 --------------------(ii)

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}

23b = 69

b= 69/23

b = 3

Plug in the value of b in equation (i)

2a + 3*3 = 13

2a + 9 = 13

2a = 13 - 9

2a = 4

a= 4/2

a = 2

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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LuckyWell [14K]

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Step-by-step explanation:

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