Answer:12 rulers and 18 protractors
Step-by-step explanation:
The image also contains instructions for two students to represent their answers graphically. Student B’s part is highlighted in yellow. Student B needs to do the following:
Part I: Drag and drop the points (12,0) and (0,18) on the number line below to show the possible values of x and y in this problem. x represents the number of rulers and y represents the number of protractors.
Part II: Highlight the answer (12,18) on the graph. This is the point where the two equations x + y = 30 and 3x + 5y = 114 intersect.
Part III: Highlight and correct the steps on how to arrive at this point on the student’s work. The student made a mistake in step 2 by writing x = 30 - x instead of x = 30 - y. The student also skipped step 3 where they need to substitute x = 30 - y into the second equation and solve for y.
