Root of any equation are always some points on a numerical axis. If in the equation one required number, then is located it on one axis. If two unknown, then this point settle down in the plane, on two perpendicular axes. If three - that in space, on three axes. The equation of a straight line is solved, as a rule in the Cartesian system of coordinates where two axes, and come down to creation of two points and their connection for receiving a straight line.
It is required to you
- Ruler, pencil.
Instruction
1. General view of the equation of a straight line: at =kkh +b. All coefficients can have various signs, it does not complicate the equation, it is necessary only to be able to operate with them at calculation. Example: the equation at the =3rd +2 is given. In this equation: k = 3, b=2.
2. For creation of a straight line it is necessary to find coordinates ""X"" - ""Y"" of two points (is possible more). Coordinate "x" is chosen randomly (better to take number less not to build the big system of coordinates). Let h1=0, h2=1. Coordinate "at" is from the equation in which instead of X the thought-up value is substituted, and is solved as a simple example. u1=3*0+2=2, u2=3*1+2=5poluchilis two points with coordinates (0;2) - the first point, (1;5) – the second point.
3. Further two co-perpendicular axes H and U which are crossed in a point "zero" are under construction. On them the found values respectively are noted, that is ""X the first"" are coordinated with ""Y the first"", and ""X the second"" – with ""Y the second"". The received points connect by means of a ruler and a pencil. This line is also a required straight line.