Of equations:
twice a number plus three times a second number is negative one. the first number plus four times the second number is
two.

Its strengthits conductivity of heat and electricity its shiny colourmalleable and ductility

1) according to the law of conservation of mass ,in all chemical reactions total mass is unchanged

Seems cool i guess ttyl

The law of conservation of mass states that a mass of an object or the amount of matter composed inside an object or thing will not change unless it is added or removed of the matter that is contained in the object itself.