exam Maths Puzzle Numerical Ability

find the slope of the line that passes through each pair of points.
(-2,-3),(0,-5)

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exam Other Question

Find the equation of the line that:

intersects with y=2x-1 on the y-axis and is parallel to y=-x

passes through the points (-4,3) and (-4,-2) Can someone explain the basic principles for the substituion method? I would like to know what can make it easier to understand if at all possible. Thanks!