AQA A Level Maths: Pure复习笔记2.7.3 Solving Equations Graphically

Solving (simultaneous) equations graphically

• This is a way to solve simultaneous equations (see Simultaneous Equations)
• Coordinates of the intersections are the solutions

How do I solve simultaneous equations using a graph?

• Use graphs and algebra together
• Sketch a graph if it has not been given
• Read/interpret a graph if it has been given

• It can be difficult to tell from a sketch if graphs intersect once, more, or not at all