To answer the equation first, let x be the number of pens. With this representation, the number of pencils she bought would be x - 4. The total amount she would have to spent for all the items is,
T = 6.70x + 3.5(x - 4)
Yo sup??
given equality is
1/x+1/y=1/2
on observation we can say that only (4,4) satisfies this equality.
Therefore only one ordered pair of integer exists.
Hope this helps
Answer:
She will need to work 11 hours
Step-by-step explanation:
She has $88, and the plane ticket is $308. 308 - 88 is 220, 220 divided by 20 is 11.