exam Maths Puzzle Numerical Ability

What is the solution for 2x-y=4
4x=2y+8

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exam Other Question

Find the sum of the measures of the interior angles of a convex polygon with the given number of sides.

Number of sides-->4

Correct answer would really be appreciated:) please help how can I Write the equation of the line passing through each of the given pairs of points. how can I Write the result in slope-intercept form,
(-1, 3) and (4, -2)