22 is 9% of what number? (round to the nearest tenth)
2 answers:
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Answer:
<em>Correct choice: B</em>
Step-by-step explanation:
<u>System of non-linear equations</u>
It's given the following system of equations:
We'll use the substitution method. Substituting y from the first equation into the second equation, we have:
Moving all terms to the left side:
Simplifying:
Factoring:
There are two solutions:
x=-4, x=2
The first solution gives a value for y:
y=-4+13=9
First solution: (-4,9)
The second solution gives a value for y:
y=2+13=15
Second solution: (2,15)
Correct choice: B
To use the quadratic formula properly, you first would want to set your quadratic equation equal to zero by moving all terms to one side and combining like terms. That would look like: 
. Now, you can use the quadratic formula: 
; note the "+" after the "-b" term should actually be a +/- as there are 2 answers to a quadratic. Last, plug in the correct numbers for a, b, and c to get your answer. 