exam Maths Puzzle Numerical Ability

Determine the slope of a line that goes through the points (1,3) and (-2,5)

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exam Other Question

Solve the system by graphing, addition and substitution methods
3x - y = 1
3x - y = 2 It takes Peter 15 minutes longer than Charles to mow the lawn by himself. Together, they can mow the lawn in 18 minutes. How long will it take Charles to mow the lawn by himself?