exam Maths Puzzle Numerical Ability

I need to solve these problems by graphing using the intercept method, please.
1. x+2y=3
x+y=2

2. -5=2x+y
y=-x

3. y=x+1
y=-x-3

4. x+y=6
3y-18=-3x

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exam Other Question
You received a year-end bonus of $17000 and invested it at 6.5%. How much additional money would you need to invest at 5% so that the return on the investments would be 6% y=1/2X-3