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1) Multiply both equations so we have the same coefficient of one of the variables. This allows us to eliminate one of the variables and solve for the other. (4x + 5y = -8) --> Multiply b...

multiply both sides by 8 --> 4+x=16subtract 4 from both sides x=12

show the formulathen show differentiation

First we must identify the recurring part of the decimal. We see that 72 is repeated, hence it is the recurring part of the decimal. Next, we say x = 0.1727272..., the reason why will become apparent shor...

They are equations with variables that we have to find. They hold in the same time.