Question on Linear Equation

Topic : Linear Equation

Question : Sue wants to buy a new printer that costs $189. She has $125 saved. She has a job that pays $8 an hour. How many hours must she work to earn enough to buy the printer?

Solution :
The cost of the printer is $189.
She has saved $125.
Also, she is paid $8 an hour to do a job.
We need to find the number of hours she works to buy the printer.
Let us assume “x” to be the number of hours she works to buy the printer.
8x + 125 =189
Now, subtract 125 on either side of the equation.
8x + 125 – 125 = 189 – 125
8x = 64
Divide by 8 on either side of the equation.
8x/8 = 64/8
x = 8
Therefore, the number of hours she works to buy the printer is 8.

Question on Linear Equation

Topic : Linear Equation

Question : 9 added to thrice a whole number gives 45. Find the number.

Solution :
Step 1. Let the required number be X.
Step 2 Thrice the whole number is 3X
Step 3 Nine added to 3X is 3X + 9
Step 4 3X + 9 = 45
Step 5 3X = 45 -- 9
Step 6 3X = 36
Step 7 X = 36/3
Step 8 X = 12
The required number is 12