exam Maths Puzzle Numerical Ability

find the arithmetic mean between 2.5 and 9.5 HOW IN THE WORLD DO YOU DO THAT?????

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exam Other Question

3x+y=5
-2x+3y+4 Can someone please help me with this problem too.
Write an equation in slope-intercept form that satisfies each condition.
passes through (2,-1) and is perpendicular to 3x-y=-3