To check whether the specified points belonged to the graph of the function, it is necessary to substitute their coordinates into the equation of the function.
For point A with coordinates x = 1 and y = 3 we have: 3 = -2 * 1 + 5 = 5 – 2 = 3. It is true, therefore, point A belongs to the graph of the function.
For point B with coordinates x = -1 and y = 6 we have: 6 = -2 * (-1) + 5 = 2 + 5 = 7. Not true, therefore, point B does not belong to the graph of the function.
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