Does point A (3.5; 4) belong to the straight line 8x + 7y = 56? point B (-7; 15)?

univerkov | September 18, 2021 | education

Let’s check if the point belongs to the graph 8x + 7y = 56 by substituting its coordinates into the equation of the straight line:

8 * 3.5 + 7 * 4 = 28 + 28 = 56.

Since the answer is 56, it means that point A belongs to the graph.

8 * (-7) + 7 * 15 = -56 + 105 = 49.

Since 49 is not equal to 56, then point B does not belong to the graph.

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