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A number sentence is a mathematical equation, such as 2x6+5x4=32.
It is equal to to 72 because 2x6=12 and 3x2=6 and 12x6=72 or if you think this is to complicated, you can do 2x6=12, 12x3=36, and then 36x2, which then also gives you 72
I would use substitution. Turn the second equation into y=8-2x, put it into the first and solve for x. Then put x into one of the equations and solve for y.So...2x-3(8-2x)=24 --> 2x-24+6x=24 --> 8x=48 --> x=6y=8-(2x6) --> y=8-12 --> y=-4
The distributive property breaks down the equation to make it more simple to do. It is often used for mental math. An example is (12x56). (10x50=500)+(2x6=12) then, (500+12=512).
It can be a bit of wood with the dimension 2x6 inches or centimetres or even millimetres. It can be a toilet or bathroom 12 Sqm. Normally you would use a tape measure in order to measure dimensions. Regards.