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Exemplo 8 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.
Resolva no papel primeiro. Depois abra a solução um passo de cada vez e pare assim que conseguir terminar sozinho.
We can approach this problem in two ways. Because one equation is already solved for the most obvious step is to use substitution.
Clearly, this statement is a contradiction because Therefore, the system has no solution.
The second approach would be to first manipulate the equations so that they are both in slope-intercept form. We manipulate the first equation as follows.
We then convert the second equation expressed to slope-intercept form.
Comparing the equations, we see that they have the same slope but different y-intercepts. Therefore, the lines are parallel and do not intersect.
O Try It do livro logo depois deste exemplo: mesma ideia, outros números. Só a resposta é dada.
Solve the following system of equations in two variables.
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