When plotting the cartesian nction, two points are sufficient to determine
line. However, in practice it is advisable
zaight line, it is likely that the working is correct.
plot three points. If the three points lie in a
ercise 7a (Revision)
Table 72 gives corresponding values of x and
y for the equation y = 3x - 2:
2
5
-5
4.
13
Table 7.2
a Choose suitable scales and draw the
cartesian graph of y = 3x - 2
b Find the value of y when x = 3-5.
c Find the value of x when y = 55.
d Write down the coordinates of the points
where the line cuts the axes.
a Given that y = 5 - 3x, copy and complete
Table 73
-3
0
+3
Table 7.3
Hence draw the graph of the fou​