Question #176429

State Cramer’s rule. Show graphically how a system of two equations in 

two unknowns has:

(i) no solution, (ii) a unique, (iii) infinitely many solutions.


1
Expert's answer
2021-03-30T16:40:17-0400

Cramer’s rule:

The solution of the simultaneous equations

{a1x+b1y=d1a2x+b2y=d2\begin{cases} a_1x+b_1y=d_1 \\ a_2x+b_2y=d_2 \end{cases}

is given by the formulae

x=d1b1d2b2a1b1a2b2x=\frac{\begin{vmatrix} d_1 & b_1 \\ d_2 & b_2 \end{vmatrix} }{\begin{vmatrix} a_1 & b_1 \\ a_2 & b_2 \end{vmatrix}} y=a1d1a2d2a1b1a2b2y=\frac{\begin{vmatrix} a_1 & d_1 \\ a_2 & d_2 \end{vmatrix} }{\begin{vmatrix} a_1 & b_1 \\ a_2 & b_2 \end{vmatrix}}


(i) {xy=0xy=1\begin{cases} x-y=0 \\ x-y=1 \end{cases}

This system has no solution.





ii){xy=0x+y=0\begin{cases} x-y=0 \\ x+y=0 \end{cases} 

This system has a unique solution.



(iii) {xy=12x2y=2\begin{cases} x-y=1 \\ 2x-2y=2 \end{cases} 

This system has infinitely many solutions.

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