exam Maths Puzzle Numerical Ability

Is the ordered pair (1,2) a solution of the equation 4x - y = 6?

my answer is 2 = 6 (false statement)

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exam Other Question

please help me solve problem: 2x-3+6x=4(3x2-)+3
pg.318 PROBLEM:
LET f(x)=3x^2-2x+1. FIND THE FOLLOWING:
f(2)
*** IN THIS MY TEACHER SAYS THE ANSWER IS 9... BUT IT SEEMS EVERYTIME I WORK IT OUT I COME UP WITH 7... PLEASE HELP AND EXPLAIN WHAT I AM DOING WRONG STEP BY STEP... THANKS :)