When 18 is subtracted from six times a certain number, the result is -42. what is the number?

Year 10 Interactive Maths - Second Edition

Linear equations are often used to solve practical problems that have an unknown quantity. We use a suitable pronumeral to represent the unknown quantity, translate the information given in the problem into an equation, and then solve the equation using the skills acquired earlier in this chapter.

If a number is increased by 8, the result is 25. Find the number.

Solution:

Example 12

If a number is decreased by 4, the result is 29. Find the number.

Solution:

Example 13

If twice a number is equal to 68, find the number.

Solution:

Example 14

If a number is divided by 9, the result is 12. Find the number.

Solution:

Example 15

If three times a number decreased by 5 equals 82, find the number.

Solution:

Example 16

If one-half of a certain number is added to one-third of the same number, the result is 10. Find the number.

Solution:

So, the number is 12.

Example 17

A rectangular paddock is twice as long as it is wide. If it has a perimeter of 570 m, find its dimensions.

Solution:

Note:

When is subtracted from six times a certain number, the result is . What is the number?

You can put this solution on YOUR website!

you can write the following equation for this, where 'x' represents the number you are looking for:

Now, solve for x:

============== Good Luck,

When 18 is subtracted from six times a certain number, the result is -42. what is the number?

Solution:

Example 12

Solution:

Example 13

Solution:

Example 14

Solution:

Example 15

Solution:

Example 16

Solution:

Example 17

Solution:

Note:

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