The wanted region is called the region of possible solutions.
2A hawker decides to spend up to E600 to buy some radios and tape recorders.
She does not want to buy more than ten articles altogether but wants to buy at
least two of each. Radios cost E40 each and tape recorders cost E80 each.
(a) Write down all the inequalities that satisfy the given conditions.
(b) Using a scale of I cm to represent one unit on each axis, draw graphs on the
same axes to show the inequalities.