Hello i really need ur help with this please

Find the length of the normal and the angle it makes with the positive x-axis. (see pictured below)

The students at jefferson middle school are raising money for a charity by selling t-shirts and hats. the number of t-shirts sold was 3 times the number of hats. the profit was $5 for each t-shirt sold and $2.50 for each hat sold. the students raised $840 for the charity. they used the system below to analyze their success and found the solution to be (144, 48). 5x+2.50y=840 x=3y how much did they earn from t-shirt sales?

Write the point slope form of the equation of the line passing through the points (-5, 6) and (0.1).