Writing and Graphing Equations in Two Variables — Quiz
Question 5 • Algebra I
Otto used 5 point 5 cups of whole wheat flour and x cups of white flour in the recipe. What is the equation that can be used to find the value of y , the total amount of flour that Otto used in the recipe, and what are the constraints on the values of x and y ?
Answer
A
y is equal to x plus 5 point 5 ; x is any integer greater than or equal to 0 , and y is an integer greater than or equal to 5 .
B
y is equal to 5 point 5 x ; x is any real number greater than or equal to 0 , and y is any real number greater than or equal to 5 point 5 .
C
y is equal to 5 point 5 x ; x is any integer greater than or equal to 0 , and y is an integer greater than or equal to 5 .
D
y is equal to x plus 5 point 5 ; x is any real number greater than or equal to 0 , and y is any real number greater than or equal to 5 point 5 .
Explanation
The total amount of flour is the 5.5 cups of whole wheat flour plus x cups of white flour, so y = x + 5.5. Since flour can be measured in fractional amounts, x can be any real number greater than or equal to 0. The smallest possible total is 5.5 cups, so y is any real number greater than or equal to 5.5; this matches choice D.
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