How do we use graphs to solve equations?

• Solutions are always read off the?x-axis
• Solutions of?f(x) = 0?are where the graph of?y = f(x) cuts the?x-axis
• If given g(x)=0 instead (Q: “by drawing a suitable straight line”) then:
  • Rearrange into?f(x) = mx + c?and draw the line?y = mx + c
  • Solutions are the?x-coordinates of where the?line?crosses the?curve 

    Note that?solutions?may also be called?roots