exam Maths Puzzle Numerical Ability

Give the standard form of the equation of the line that is perpendicular to
y=6/5x+4 and contains (-8,4).

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exam Other Question

Algebraically determine the EXACT roots in simplest form for (5/x-3)=(x/x+1) Determine whether 3 is a solution of the equation 9 x +5 = 30

Again can someone help please?