Exemplo 2 de Algebra and Trigonometry, 11.1 Systems of Linear Equations: Two Variables
Problema e solução em inglês, como no livro original.
Solve the following system of equations by graphing. Identify the type of system.
Resolva no papel primeiro. Depois abra a solução um passo de cada vez e pare assim que conseguir terminar sozinho.
Solve the first equation for
Solve the second equation for
Graph both equations on the same set of axes as in Figure 4.
The lines appear to intersect at the point We can check to make sure that this is the solution to the system by substituting the ordered pair into both equations.
The solution to the system is the ordered pair so the system is independent.
O Try It do livro logo depois deste exemplo: mesma ideia, outros números. Só a resposta é dada.
Solve the following system of equations by graphing.
Como foi?