exam Maths Puzzle Numerical Ability

A washer-dryer combination costs $1200. If the washer costs $220 more than the dryer, what does each appliance cost separately?

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Please help me explain set-up of equation:
1. A business invests $10,000 in a savings account for two years. At the beginning of the second year, an additional $3500 is invested. 1. solution of x2y5y-2x-2
2. solution of p0x-1(x-2x0)
3. solution of m5b2mb-2
4. solution of 4x2p0(3xp5-2x-2)

and how you arrive at the solutions thank you