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The difference of two numbers is 11. Their sum is 87. Find the numbers.

Sagot :

itsandypandy

Answer:

x = 49; y = 38

Step-by-step explanation:

This can be solved with simultaneous equations;

Let the first number be x and the second be y.

If their difference is 11 then

⇒ [tex]x - y = 11[/tex]

If their sum is 87 then

⇒ [tex]x + y = 87[/tex]

If we add these two equations together, we can eliminate y;

⇒ [tex]2x = 98[/tex]

⇒ [tex]x = 49[/tex]

Now substitute into either equation;

⇒ [tex](49) - y = 11[/tex]

⇒ [tex]y = 38[/tex]

marcthemathtutor

Answer:

38 and 49

Step-by-step explanation:

Let the numbers be x and y

Given that the difference of the numbers is 11, we can write:

x - y = 11 -------- (eq 1)

Also given that their sum is 87, we can write:

x + y = 87 --------(eq 2)

we now have a system of 2 equations with two unknowns.

Solving by elimination:

(eq 1) + (eq 2)

(x-y) + (x+y) = 11 + 87

x - y + x +y = 98

2x = 98  (divide both sides by 2)

x = 98/2 = 49    (answer)

substituting this into equation 2

x + y = 87

49 + y = 87   (subtract 49 from both sides)

y = 87 - 49

y = 38  (answer)

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