exam Maths Puzzle Numerical Ability

Use substitution to solve each system of equations. If the system does not have exactly one solution, state whether it has no solution or infinitely many solutions.

2x+3y=

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I wrote the problem i wrote before wrong. This is what it really is.

A total of $25,000 is inested in two funds paying 5% and 6% annual interest. The combined annual interest is $1400. How much of te $25,000 is invested in each fund? Paddled up stream at an average speed of 2mi/hr. Paddled downstream at ave. speed of 3mi/hr. what is the still paddling speed and the current speed?