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I got this question from a past exam paper does the point (8 , 4 , -5) lie on the plane 7x - 3y + 4z = 8?

Do you work it out as follows because cant find this example in my Linear Algeria book?

7(8) - 3(4) + 4(-5) = 8

56 - 12 - 20 = 8

24 is not equal to 8

Therefore the following point does not lie on the plane.

Thanks

Stephen

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# Does the following point lie on plane?

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