How do you solve the following algebra problem? -7x+6y=-5 2x+47=-10
1 answer:
In the general case, you have two choices. Isolate one unknown in one of the equation and substitue in the other, or remove one unknown from one of the equation by adding a multiple of the other.
In your case, we will only do the first method because the second equation has only one unknown, x. We isolate it :
You replace in the other equation x by its new value, which yields
You just have to isolate y :
If the +47 in the second equation was meant to be +4y... well... It is a different story. Use the first method I described (substitution). It is similar to what I detailed.
In your case, we will only do the first method because the second equation has only one unknown, x. We isolate it :
You replace in the other equation x by its new value, which yields
You just have to isolate y :
If the +47 in the second equation was meant to be +4y... well... It is a different story. Use the first method I described (substitution). It is similar to what I detailed.
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The number of days in which the air quality index exceed 100 in the year 1988 is 75 days. Then the correct option is B.
<h3>What is a function?</h3>The function is an expression, rule, or law that defines the relationship between one variable to another variable. Functions are ubiquitous in mathematics and are essential for formulating physical relationships.
The air quality index (AQI) is given by the function.
Where n be the number of days the AQI exceeds 100 in a given year.
For , then we have
More about the function link is given below.