book Maths Puzzle Numerical Ability

Write the equation of the line with slope 4 and y-intercept (0,5).

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book Other Question

Walt and Gail left a stable for a ride to a mountain lookout. On the way up, they averaged 3 mi/h. On the way back along the same trail, they averaged 5 1/4 mi/h, and the return tr 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.