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solve this simultaneous equation: 2x + 3y = 19 (Eq1) and 3x + y = 11 (Eq2)

Begin by multiplying the second equation by three in order to get a 3y value: 9x + 3y = 33. We can now subtract equation one from equation two, 9x + 3y = 33 and 2x + 3y = 19 -->7x + 0y = 14. Resulting in,...
TB
Answered by Tomas B. • Maths tutor
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What is essential to an essay?

The style of writing and essays can definitely be ambiguous! However, there are some crucial things you need to be doing when writing an essay especially for A level History.Make an argument and keep to it -...
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Answered by Adila M. • History tutor
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How to divide or multiply by 10s, 100s, 1000s

When dividing a number, the number gets smaller . So, the decimal point moves towards the left . However, when you are multiplying a number, the number gets bigger . So, the decimal point moves towards the r...
AM
Answered by Adila M. • Maths tutor
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In the flowing equitation 2H2+O2→2H2O how many grams of oxygen are needed to make 9g of water?

2H 2 +O 2 ->2H 2 OThe best way to answer any mass balancing questions like this is to set the information in a table as follows and fill in the blanks: 2H 2 + O 2 -> 2H 2 OMass ? 9gMr Moles 1. The firs...
CO
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Describe how elements are arranged in the periodic table

Elements in the periodic table are arranged in order of increasing atomic (proton) number. Elements with the same number of electron shells are arranged in the horizontal rows (periods), and elements with si...
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Answered by Georgia C. • Chemistry tutor
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