Question

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

Answer 1

Answer:

1/28

Step-by-step 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*($\frac{1}{4}$) - 4*($\frac{3}{7}$)         multiply 1 by 7 and 4 by 3
• $\frac{7}{4}$ - $\frac{12}{7}$              multiply 7/4 by 7 and 12/7 ny 4 to get the same denominator
• $\frac{49-48}{28}$
• 1/28