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Solve the simultaneous equation: 3x+y =-4 and 3x-4y=6

The first step would be to rearrange the first equation to make y the subject: 3x+y=-4 ----> y=-4-3x Next we want to substitute this value of y into the second equation 3x-4y=6 -----> 3x-4(-3x-4)=6 Nex...
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Answered by Samuel P. • Maths tutor
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In terms of electron transfer describe what happens when one atom of calcium reacts with two atoms of chlorine and give the ions that are formed.

When these atoms react together Calcium chloride, CaCl 2 , is formed. Calcium atoms have two electrons in their outer shell, which can be determined from the fact they are in group 2 of the periodic table. C...
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Answered by Lauren M. • Chemistry tutor
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How do I form the perfect tense in French?

The perfect tense is used in French to described completed actions in the past, such as 'I ate an apple' or 'I have done my homework' .e.g. Je mange une pomme = I eat an apple (present tense) // J'ai mangé u...
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Answered by Hannah V. • French tutor
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What is the role of insulin in the body?

Insulin is a hormone released by the pancreas in response to high glucose levels in the blood. It primarily acts to reduce blood glucose levels. It does this by signalling muscle and fat cells to take in glu...
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Answered by Sophie B. • Biology tutor
6371 Views

Explain the way in which Anti Diuretic Hormone regulates the water content of blood

How much water is in blood is defined by its osmolarity, i.e. how concentrated solutes such as sodium ions are in the blood. The pituitary gland in the brain releases ADH (Anti Diuretic Hormone) if there is ...
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Answered by Jamie W. • Biology tutor
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