Solve the systems below:
1. x + 7y = 0
2x − 8y = 22
2. x − y = 3
7x − y = −3
3. −9 + 5y = −4x
−11x = −20 + 9y
4. y = 4x − 9
y= x− 3
Tell which method you used to solve each system and why you chose that method.

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?

Linda and ralph have signed a contract to purchase a home. the closing date is april 27, and the buyer owns the property on the day of closing. the selling price of the home is $782,500. linda and ralph obtained a fixed-rate mortgage from a bank for $685,000 at 7.35% interest. the seller has already paid $14,578.15 in property taxes for the coming year. how much will linda and ralph owe in prorated expenses? (3 points) $64,925.65 $34,347.06 $10,496.82 $9,945.06

How do you find the rate of change using a graph?