exam Maths Puzzle Numerical Ability

When there is only 2 I have no trouble but when 3 or more is added I get all messed up.

Solve each of the following systems of linear inequalities graphically.

3x-y<=6
x>=1
y<=3

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exam Other Question

Eric has 130 coins consisting of nickels and quaters. The coins combined value come to $15.90. Can you please help me find out how manyof each coin eric has. I am not sure how to complete.
Thanks
f(x) = 3(x-3)^2
The vertex is:
The line of symmetry is: