What is the first step in solving this system of equations by elimination?
1 answer:
Answer:
B. Add the two equations.
Step-by-step explanation:
Lets solve our system of equations step-by-step
Step 1. Add the two equations
2x – 2y = 5 +
5x + 2y = 9
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7x = 14
Step 2. Solve for x in the resulting equation
7x = 14
x = 2
Step 3. Replace the value of x in any of the original equations
2x – 2y = 5
2(2) – 2y = 5
4 – 2y = 5
-2y = 5 - 4
-2y = 1
We can conclude that the correct answer is: B. Add the two equations.
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Question 1:
<h3>Answer: The number does <u>not</u> change</h3>Removing the zero from 0.76 leads to .76 which is the same as before. Both lead to in scientific notation.
Personally I prefer the zero up front to make the decimal point stand out easier. Of course it's just a preference, so its up to you to decide which you prefer.
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Question 2:
<h3>Answer: Yes the number changes</h3>Taking the zero out of 10.25 leads to 1.25 which is definitely a different number (and smaller). Therefore, this zero is a significant digit compared to before.