exam Maths Puzzle Numerical Ability

how could i solve this linear equation using a combination method
4x-3y=11
3x+2y=-13

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exam Other Question

can you solve?
A boat moves 7kph in still water. It ravels 45 km upriver and 45 km downriver in a total time of 14 hours. What is the speed of the current?
I am more interested in the work than the answer so please show me step by step.
Thanks This is from a worksheet. I cannot figure this one out at all.

y^3+5y^2-9y-45
The instructions are to factor completely.