The function is given by the formula y = 2x + 3. Does the graph of the function belong to the point A (1; 5) B (-1; 1).

| July 1, 2021 | education

To find out whether a point with certain coordinates belongs to the graph of the function, it is enough to substitute the coordinate values ​​into the formula of the graph of the function. If the equation takes the form of true equality, then the point belongs to the graph of the function, otherwise – the point does not belong to the graph.

1. Consider the coordinates of point A: x = 1, y = 5.

Substitute these values ​​into the function formula: 5 = 2 * 1 + 3 = 2 + 3 = 5, 5 = 5.

This means that point A belongs to the graph y = 2 * x + 3.

2. Consider the coordinates of point B: x = -1, y = 1.

Substitute these values ​​into the function formula: 1 = 2 * (-1) + 3 = -2 + 3 = 1, 1 = 1.

This means that point B belongs to the graph y = 2 * x + 3.

Answer: both points belong to the graph.



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