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The heart is divided into four chambers: the right atrium, right ventricle, left atrium and left ventricle [insert diagram]. The right side of the heart pumps blood to the lungs. The left side of the hear...

3x+7y=18 (eqn 1)  -multiply by 7->   21x+49y=126 (eqn 1*)

7x+9y=8  (eqn 2)  -multiply by 3->    21x+27y=24 (eqn 2*)

(eqn 1*)-(eqn 2*)  --> 22y=102 therefor y=51/11

sub in thi...

This question can be answered by the elimination method. I will choose to eliminate 'y' in this case. Firstly, multiply equation (1) by 2, resulting in 8x+2y=14. Now we can subtract eqaution (2): 3x+2y=9 ...

The best way to answer these kind of questions is by moving all the unknowns to one side. In this case, the only unknown is x, so we should start by moving all the x's to one side. Since there are 4x's on...

Atmospheric CO2 is used by trees for photosynthesis. Deforestation means that there are less trees undergoing this photosynthesis reaction, so less CO2 is taken from the atmosphere. The trees that are cut...