exam Maths Puzzle Numerical Ability

The slope of the line that passes through the points(-2,4) and (-3,7) is_?
a. negative b. postive c.undefined d.zero

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Find two consecutive positve integers such that the sum of thier square is 85. Please help.

Solve the system by substitution.

3x - y = -7
x + y = -9

Thanks
JMS