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Solve, by method of substitution, the simultaneous equations: 5x+y=22 2x+y=10

Solve by substitution:5x + y = 22 (1)2x + y = 10 (2) First let us label the equations 1 and 2. In order to solve this set of equations we need to rearrange one of the equations so that we have one of the var...
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Answered by Amy W. • Maths tutor
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Describe how oxygen moves into the blood at the lungs.

Oxygen moves via diffusion from the alveoli in the lungs where there is a high concentration of oxygen, into the blood where there is a low concentration of oxygen - it moves down its concentration gradient.
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Answered by Isobel S. • Biology tutor
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Solve 8x+ 9 > 1 + 4x

8x + 9 > 1 + 4x . Bring all x values to the Left hand side by subtracting 4x from each side. 8x -4x +9 >1 = 4x +9 >1 Bring all numbers to the right hand side by subtracting 9 from each side 4x > ...
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Answered by Dominique E. • Maths tutor
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Carbon from dead leaves is recycled through the carbon cycle. Explain how Carbon is recycled to new leaves.

Dead leaves fall from plants to the ground. These leaves contain carbon. They are digested by microorganisms like bacteria which take up carbon and then respire it into the atmosphere. Plants are autotrophs ...
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Answered by Ewa M. • Biology tutor
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Solve the following simulateous equations: 3x+y=11 and 2x+y=8

Minus 2x+y=8 from 3x+y=11 so that the y's cancel out (y-y=0). Then we get the equation 3x-2x=11-8.So we get x=3.We can substitute this value back into one the orginal equations: y=11-3(3)=2 - so y=2.We can c...
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Answered by Cameron G. • Maths tutor
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