Why can we subtract one equation from the other in a system of equations. All the linear equations are used to construct a line. Linear and nonlinear equations usually consist of numbers and variables.
X 2 7x 12 0.
If we substitute x by -3 in the equation 2x 8 -2x - 4 we obtain. If we substitute x by -3 in the equation 2x 8 -2x - 4 we obtain. Yx c1y1x c2y2x ypx. A variable is a letter that represents an unknown number.