Solve the simultaneous equations: 3x + y =11, 2x + y = 8
x = 3, y = 2
NB
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Solve 3x - 5 = 13
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Harry drives from Exeter to London in 4 hours at an average speed of 70km/h. Ron drives from Exeter to London in 5 hours. (a) Assuming Ron took the same route as Harry, calculate Ron's average speed.