Question

# Solve the system of equation by using elimination:

Hint:

### Let and now we get the equation in a and b

Now find values of a and b .After finding a and b substitute them in and and find the values of x and y .

## The correct answer is: x = 8 ; y = 4

### Ans :- x = 8 ; y = 4

Explanation :-

Let now we get the equation in a and b

— eq1

— eq2

Step 1 :- find value of b by eliminating a

Do 2(eq2) - 7(eq1) to eliminate a

∴ b = 1/4

Step 2 :- find value of a by substituting b=1 in eq1

∴ a = 1/8

Step 3 :- substitute a and b in and find values of x and y

x = 8 and y = 4 is the solution to the given pair of equations.

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### The circumference of Earth is estimated to be 40,030 kilometers at the equator. Which of the following best approximates the diameter, in miles, of Earth's equator? (1 kilometer miles)

**Note:**

There are many other units of length which are often used. For example: inch, foot, yard, centimetre, parsec, lightyear, nanometre, etc. They measure anything between atoms to a galaxy.

Some relations between them are given by

1 kilometer = 39370.0787 inches = 3280.84 feet = 100000 centimetre

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### The circumference of Earth is estimated to be 40,030 kilometers at the equator. Which of the following best approximates the diameter, in miles, of Earth's equator? (1 kilometer miles)

**Note:**

There are many other units of length which are often used. For example: inch, foot, yard, centimetre, parsec, lightyear, nanometre, etc. They measure anything between atoms to a galaxy.

Some relations between them are given by

1 kilometer = 39370.0787 inches = 3280.84 feet = 100000 centimetre

1 mile = 63357 inches = 5279.75 feet = 160926.94 centimetre