book Maths Puzzle Numerical Ability

Find an equation for the line with the given property. Express answer in general form and slope-intercept form of the equation of a line.

Problem
Perpendicular to the line x = 8; containing the point (3,4)

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book Other Question
The altitude to the base of an isosceles triangle _______ longer than a leg of the triangle.

a)must be
b)may be
c)cannot be please help me solve this.
write an equation of a line given (x1,y1)=(12,7) and (x2,y2)=(-4,5)