exam Maths Puzzle Numerical Ability

Find the slope of the line: y + 4= -1/2(x+3)

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exam Other Question

Are the following lines parellel, perpendicular, or neither?

L1 through (-4, -7) and (1, 3)
L2 through (2, 6) and (4, 10) write the equation of the line with slope -1/2 and y-intercept (0,3)

Thanks for all your help