exam Maths Puzzle Numerical Ability

Y= -1/3X+1
Y= 1/3X-3

The unit in the text book that my class and I are on is Solving systems: Substitution

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exam Other Question

a person on a bike leaves an hour before a person on a motorcycle. the person on the bike is travelling at 10 mph. the person on the motorcycle is travelling at 40 mph. how long before the person on the motorcycle overtakes the person on the bike? Please help me solve this equation.
-2x = 8?
a.x = 4
b.2x = -8
c.3x + 5 = 6x - 17
d.3x + = 12x + 17
Thank you