algebra 1 unit 4 model test key
number of pens. Equation: 2x + y = 10. Possible solutions: x = 0 ⇒ y = 10. x = 1 ⇒ y = 8. x = 2 ⇒ y = 6. x = 3 ⇒ y = 4. x = 4 ⇒ y = 2. x = 5 ⇒ y = 0. Answer: The student can buy various combinations, such as 3 notebooks and 4 pens. Using the Model Test Key for Effective Study Tips for Students