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Question
6.2x-0.5y=-27.8
0.3x+0.4y=68.7
Hi, Samantha,
Subject: linear combInations
Question: 6.2x-0.5y=-27.8
0.3x+0.4y=68.7
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When you send me a problem, please tell me:
1. What math subject you are studying. Don't just say math.
2. What are the instructions for the problem? Don't just send a few numbers or equations. What am I supposed to do? How is it supposed to be done?
3. What did you try to do already? Maybe I can put my finger on your difficulty.
In this one,
6.2x-0.5y=-27.8
0.3x+0.4y=68.7
I am guessing that you are put off by the decimal points. In that case, just multiply by 10 to clear the decimal fractions:
62x - 5y = -278
3x + 4y = 687
Then solve by whatever method you are studying.
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Advanced Math
Answers by Expert:
Paul Klarreich
Expertise
I can answer questions in basic to advanced algebra (theory of equations, complex numbers), precalculus (functions, graphs, exponential, logarithmic, and trigonometric functions and identities), basic probability, and finite mathematics, including mathematical induction. I can also try (but not guarantee) to answer questions on Abstract Algebra -- groups, rings, etc. and Analysis -- sequences, limits, continuity. I won't understand specialized engineering or business jargon.
Experience
I taught at a two-year college for 25 years, including all subjects from algebra to third-semester calculus.
Education/Credentials
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