Question

If x=1/4 and y=3/7, evaluate the following expression: 7x−4y

Answer 1

1/28

Explanation:

The expression is 7x-4y

• x = 1/4
• y= 3/7

Replace x by 1/4 and y by 3/7

• 7x-4y
• 7*(
  `(1)/(4)`) - 4*(
  `(3)/(7)`) multiply 1 by 7 and 4 by 3
• 
  `(7)/(4)` -
  `(12)/(7)` multiply 7/4 by 7 and 12/7 ny 4 to get the same denominator
• 
  `(49-48)/(28)`
• 1/28