Mathematics, 11.07.2019 17:30 AshleyRojas7187

An appropriate description of the substitution method would be

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The substitution method is one of several methods used for solving systems of equations. If, for example, you have a system of two linear equations in x and y, you could solve either equation for x and subst. the resulting expression in y into the other equation. This eliminates x and allows you to find the value of y.

Example: Solve this system of linear equations:

3x + 4y = 7
2x + y = -3

Let's solve the 2nd equation for y: y = -2x - 3. Now substitute -2x -3 for y in the other equation: 3x + 4(-2x-3) = 3 (Note how y disappears!)

Then 3x -8x - 12 = 3; -5x = 15 => x=-3.

Again we substitute: Subst. -3 for x in either of the given equations and solve for y.

Write your solution in the form (x,y).

These are examples of the subst. method and its applications.

Answer from: Quest

introduction, methodology, results, discussion

step-by-step explanation:

an observational study is one which consists of actual observation to record data and then analyse the data.

there are a number of factors that should be analyzed before starting an observational study.

the main four factors are:

i) introduction: this should be analysed to check whether the purpose of the study is correctly established and the data recorded are appropriate for the study

methodology: the method of collecting the data, such as whether randomly selected, and whether sample size matches with the population to be studied, whether questions asked are easy to answer by common men, etc.

results: then results such as summary of data with comments should be studied thoroughly

discussion: the last is the discussion, this can be either by management people or persons who are all interested , etc.

Answer from: Quest

that is the sum

step-by-step explanation:

there are no other answers without knowing the variables values

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