Question

Sarah is selling cookies and brownies to raise money for her school trip. She needs to raise at least $350. She is selling cookies for $1 and brownies for $2. Let x represent the number of cookies and y represent the number of brownies. Write an inequality to represent how many cookies and brownies Sarah would have to sell to have enough money for her trip?

Answer 1

Let x represent the number of cookies
      y represent the number of brownies

     $1x + $2y  >= $350

or 

    x + 2y >= 350

Answer 2

Since cookies are $1 each  ---  $1x
Brownies are $2 each ----- 2y
And she needs at least $350 means she can make either more that 350 or exactly 350 hence the inequality will be
x + 2y ≥ 350