book Maths Puzzle Numerical Ability

4 mile ride = $3.10, 7 mile ride = $4.15, what is linear equation? How much does 12mile ride cost? How far can I go on $8?

If I tip 10% of cost, how far can I go on $10?

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book Other Question

2x+y=0
x-2y=-10
Solve using the addition or substitution method My question says to solve the system of this inequalitie by graphing.
y-x<0
3y>2x-15 (the > has a line underneath of it.)

I dont know how to solve this or graph it. could y