Solving systems of equations using substitution
y=-5
5x+4y=-20

m figure out how to do these types of problems i seriously don't get it

The total cost of anja’s trip to the dentist was $628.35. she paid a flat fee of $89.95 which included the checkup and cleaning and then had 4 cavities filled, each of which cost the same amount. which shows the correct equation and value of x, the cost of each cavity filling?

Which value would be a solution for x in the inequality 47-4x< 7

Triangle knm is what is true about the sides of knm