What is the equation, in slope-intercept form, of the line that passes through (0, −2) and has a slope of −3?

Which is the equation of a line perpendicular to the line with the equation 3x+4y=8

Tobias gold sells computers at the office center he's guaranteed a minimum salary of $1,959 per month plus 6.3% commission on total sales how much in total sales is he

Which has the greater energy, light of wavelength 519 nm or light with a frequency of 5.42 x 10^8 sec^-1?