exam Maths Puzzle Numerical Ability

In point-slope the problem is (1,2) Slope undefined and I was not sure how to find the slope with only one ordered pair.

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exam Other Question

x+y=100
0.5+0.40y=25
Please Solve using the quadratic formula?? someone plesae help i dont even know what the quadratic formula is!!! 5x^2 - 3x - 3 = 0