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First thing we have to do is to eliminate one of the variables, either x or y (it doesn’t matter which one). In order to achieve that, we aim to have the same co-efficient (number in front of x or y) of a va...

Diagrammatically, this is where the demand and supply curves meet. The demand curve shows the quantity demanded by consumers at different prices, and the supply curve shows the quantity producers are willing...

The key here is to eliminate one of the variables; it doesn't matter whether we start by trying to get rid of x or y we will arrive at the same solution. For us to eliminate either x or y it is easiest to fi...

Cell walls provide plant cells with protection and structure. Protection may be from adverse conditions or from biotic threats like fungi or bacteria. The structure of the plant is dependent on the presence ...

When forming a sentence in the past, or perfect tense in German, it is always formed with a conjugation of 'sein' or 'haben', plus the past participle of the main verb. It is much more common to use the verb...