exam Maths Puzzle Numerical Ability

Determine whether 3 is a solution of the equation 9 x +5 = 30

Again can someone help please?

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exam Other Question

Give the standard form of the equation of the line that is perpendicular to
y=6/5x+4 and contains (-8,4). It is in Chapter 5 section 2 Written Exercises #16.

Given: ABCD is a parallelogram.
W,X,Y,Z are midpoints of segments AO,BO,CO,DO.

Prove: WXYZ is a parallelogram.