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Is x=4 a solution for 2x+4=0

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Easy to verify. Put 4 instead of x in the equation. You get 2*4+4?=0. Obviously 2*4+4=3*4=12, and 12 is not equal to zero. The value x=4 is not a solution of the equation.
2x+4=0, gives 2x=-4 and x=-4/2=-2

Posted on Feb 09, 2012

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i am assuming this is to do with programming the machine or a maths question in the wrong section.

fortunately i was always good at maths.

the graph shown will be a straight line.
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Here are some screen captures to help you
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also in the case of your example:

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