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Equation A: 2x + 5y = 8

Equation B: 4x + y = 7

2A: 4x + 10y = 16

2A - B: 9y = 9, Therefore y = 1

Sub y back into equation A to find x:  2x + 5 = 8,  2x ...

times both sides by both denominators

= (2x+3)(2x+1) - (2x-8)(x-4) = (2x+1)(x-4)

times out brackets

= (4x² + 8x +3) - (2x² -16x +32) = 2x² -7x -4

2x become x²

3x^1/2 becomes 2x^3/2

1 becomes x

sub 9 into values for x = (81 - 54 +9) which equals 36

sub 4 into values for x = (16 - 16 + 4) whi...

Mes vacances préférées étaient ceux de l’année dernière ou j’ai fait un tour de l’Europe de l’Ouest. Nous sommes partis de Londres, et avons visité 8 pays au total. Mon pays favori était la Suisse, car le...

reactivity increases DOWN the group

Extra shells of electrons means there is increased shielding, and therefore atomic radii increases

even though nuclear charge increases, the extra shieldi...