第30课时： 5.1 Introduction (122-123)
第五章 Linear Graphs （122）
BY THE END OF THIS CHAPTER, YOU SHOULD BE ABLE TO:
write Cartesian coordinates in two dimensions as an ordered pair;
use Cartesian coordinates in two dimensions;
plot sets of ordered pairs on graph papers;
identify and draw horizontal lines;
identify and draw vertical lines;
choose suitable scales for the x and y axes;
complete the table of values for a linear equation;
draw linear graphs:
use linear graphs in practical situations;
state the gradient of a linear graph;
use gradient of linear graphs to make decisions.
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