exam Maths Puzzle Numerical Ability

If f(x) = 4x - 6, what is f(-3)?
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exam Other Question

My Problem is to find the slope and y intercept for x= -7. Should my answer be;
1.)Slope:0; y-intercept;none or 2)Slope: undefined; y-intercept:none? I want to say that the answer decide whether the graphs of the two equations are parallel lines:
3y=x-12,6y=2x+12