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First identify which unknown has the same coefficient. In this case it is y.Either add or subtract the two equations to eliminate y. In this case we subtract one equation from the other (can be either). 3...
Right angle means use Pythagorus:a2 + b2 = c2thereforea2 = c2 - b2 = 72 - 42 = 49-16 ...
As described, the meal deal consists of 1 sandwich, 1 snack and 1 drink. To work out the number of combinations possible you times the number of available sandwiches, by the number of available snacks, by...
Make both equal to y:y = 18 - 2xy = x - 6Make both equal to each other:18 - 2x = x - 63x = 24x = 8Substitute x into one of the original equations:x - y = 68 - y = 6y = 2So x = 8 and y = 2
(2n+3)2-(2n+1)2=(4n2+12n+9)-(4n2+4n+1)=8n+8= 8(n+1)Hence a multiple of 8
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