http://www.vcaa.vic.edu.au/Documents/exams/mathematics/2011furmath2-w.pdf
Module 3 question 2 c and d
Looking at the solutions, i kinda get it but not 100%. Could some please show me in detail how they get the answer. Seeing this question made me consider re-evaluating my aim for a 45+ study score.
Hi
Question 2C- you are looking for the breakeven point. Since the question is 'after how many hours' you can specify the exact breakeven point. They give u an equation d= -3x +16. Why dont we put this equation on the graph with michael
this way we can see the breakeven point. The intercepts can be (0,16) and (5,1) Draw a line between these points and extending. The point where Michael and Katie meet is at 2 hours. This means that after 2 hours Katie passes Michael.
Question 2D-
3k apart can be from (Solve,Equation 1 (include time here)- Equation 2 = 3, time) on cas. This will give u a time of 13/8.
However the question asks u for how long they spoke to each other. You will have gotten this question right if u drew the graph. Because the line passes straight through at t=3... so 3 - 13/18 gives u the answer. Which is 1.38
Tips- Drawing the extra given equations with already an provided graph and equation is really important