Solve the system 2x-4y = 5    x+3y = 7

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We have the two equations 2x-4y = 5 and x+3y = 7 to solve for x.

x+3y = 7 can be rewritten in terms of x as x = 7 - 3y.

Now substitute x = 7 - 3y in 2x-4y = 5

=> 2( 7 - 3y) - 4y = 5

=> 14 - 6y - 4y = 5

=> -10y = 5 - 14

=> -10 y = -9

=> y = 9/10

As x...

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