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Solve the simultaneous equations 3x + 4y = 17 and 4x + y = 14

Eq1: 3x + 4y = 17 Eq2: 4x + y = 14 Eq2 x 4: 16x + 4y = 56 Subtract Eq1 from this to isolate x: 16x + 4y - 3x - 4y = 56 - 17 Simplify: 13x = 39 Solve for x: x = 3 Substitute x into Eq1: 3(3) + 4y = 17 9 + 4y ...
DH
Answered by David H. • Maths tutor
9366 Views

Why is the heart known as a double pump?

The heart is known as a double pump becasue each half pumps blood around a different circulation system. The right side pumps blood to the lungs, while the left side pumps blood around the body.
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Answered by David H. • Biology tutor
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How can I make the difference between the 'passé simple' and the 'imparfait'

The 'passé simple' is a tense for a past, finished action whereas, the 'imparfait' is used to describe an action in the past, longer and maybe unfinished. Passé simple is a precise moment whereas Imparfait i...
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Answered by Florence B. • French tutor
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I don't understand what exactly a mole is, could you please explain it to me?

Basicallly a mole refers to a number, in the same way as a dozen also refers to a number, this number being 12. Except instead of 12, the word mole refers to the number of 6 x 10 23 , which is basically a 6 ...
AP
Answered by Andrea P. • Chemistry tutor
4614 Views

What is the difference between direct and indirect object pronouns?

A pronoun is a word that is used in place of a noun, often to avoid repetition. If we are replacing the object of a sentence with a pronoun, we will be using either the direct object pronoun (DOP) or indirec...
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Answered by Nic B. • French tutor
15482 Views