Applications Using Linear equations

Question

1.- The sum of five times a number and eight is 12. Find the number

2.- The difference of two times a number and six is nine more than the number. Find the number

Answer 1

You need to write the algebraic expression for "The sum of five times a number and eight". 

Let's call this number x.

Five times a number and eight is 12 is equivalent to: 5x+8= 12

5x = 12 - 8

5x = 4

x = 4/5 = 0.8

So, the number is 0.8