Graphs 7
3 marks · NormalUse a graph to solve the equation for between -3 and 3.
State what two graphs you would draw and explain how their intersection gives the solution.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
Show answer
Also accept: Explanation includes drawing and , or rearranged version.
Common mistakes: Only using one graph; not stating intersection; choosing wrong graphs.
Show mark scheme and worked solution
Marking points
M1 · 1 mark · States/draws and (or appropriate rearrangement).
M2 · 1 mark · States correctly that the solution is where the two curves/lines intersect.
A1 · 1 mark · Explains how the x-coordinates of intersection points are the solutions to .
Worked solution
To solve graphically:
1. Draw for from -3 to 3.
2. Draw the straight line .
3. The solution(s) to the equation are the values of where the two graphs intersect.