2.1.线性代数 Linear algebra provides a way of compactly representing and operating on sets of linear equations.For example,consider the following system of equations: 4x1-5x2=-13 -2x1+3x2=9 In matrix notation,Ax =b,where 4=(4名)x=(0)b=(〉 3/812.1. 线性代数 Linear algebra provides a way of compactly representing and operating on sets of linear equations. For example, consider the following system of equations: 4x1 − 5x2 = −13 −2x1 + 3x2 = 9 In matrix notation, Ax = b, where A =  4 −5 −2 3  , x =  x1 x2  , b =  −13 9  3 / 81