book Maths Puzzle Numerical Ability

Flying against the jetstream, a jet travels 6390 km in 9 hours. Flying with the jetstream, the same jet travels 5150 km in 5 hours. What is the speed of the jet in still air, and what is the speed of the jetstream?

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please help me with my homework. i've already tried sketching the graph but i'm not sure if it's right.i'm confused with the problem. i hope you can help me . it's alright if you Please help, I am totally lost when it comes to graphing inequalities

Graph each system
y > 2x-1
y< -x-4

Thank you