book Maths Puzzle Numerical Ability

I need to solve the equation 4x + y > 4 then determine the half plane which I would show on the graph. I am lost at how to do this.

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book Other Question

Write the equation of the line with slope 4 and y-intercept (0,5). i need help! how do u find out the constant of variation for an equation and determine the slope of a line?