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Solve the simultaneous equations: 3x+7y=18 and x+2y=5

To help us to see what we need to do in this question, I would always line the equations up one above the other, and label them (1) and (2). Here we'll say that (1) is 3x + 7y =18 and (2) is x+ 2y =5 - To so...
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Answered by Harriet C. • Maths tutor
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Balance the following equation: C3H8 + O2 ---> CO2 + H2O

There will be no need for state symbols. First of all, to balance these equations, list the number of each atom, for both sides of the equation. In this example, it would be: Carbon: 3 Carbon: 1 Hydrogen: 8 ...
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Answered by Ganesh V. • Chemistry tutor
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what is x+24=15

x+24-24=15-24 x=15-24=-9
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Answered by Ruyuan W. • Maths tutor
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What are the negative effects of climate change?

(A typical 10 mark question) The Earth's temperature has fluctuated over the last 10,000 years, causing the climate to change. This change is caused by many long and short term factors. As temperatures rise,...
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A straight line goes through (0,1), (2,5) and (4,9). The equation of the straight line is y=2x+1. Is the point (7,12) on this straight line?

First we'll figure out what the numbers in the co-ordinates mean. On the point (7,12) x= 7 and y=12. - The equation of the line is in the form of y=mx + c so for the point to be on the line, the y value must...
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Answered by Harriet C. • Maths tutor
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