How do you write an equation of a line with Slope - 9/4 and y- intercept -4

How can we find the measure of an exterior angle if we know the measurement of an interior angle

22. catie is starting a babysitting business. she spent $26 to make signs to advertise. she charges an initial fee of $5 and then $3 for each hour of service. write and solve an inequality to find the number of hours she will have to babysit to make a profit. interpret the solution.!

In which direction does the left side of the graph of this function point? a(x) = 3x - x2 + 4x - 2