Choose a system of equations with the same solution as the following system:

6x + 2y = −6
3x − 4y = −18



a: 8x + 4y = −4
17x + 2y = −28

b: 12x + 4y = 12
21x + 2y = −36

c: 6x + 8y = −36
15x + 6y = −60

d: 6x + y = 15
15x − y = −9

Starting at home, emily traveled uphill to the hardware store for 606060 minutes at just 666 mph. she then traveled back home along the same path downhill at a speed of 121212 mph. what is her average speed for the entire trip from home to the hardware store and back?

Amir wants to proportionally increase the size of a photo to create a poster for his room. the size of the original photo is shown. complete the statement and then answer the question to represent ways that amir can increase the size of his photo.

Find the maximum value of p= 4x + 5y subject to the following constraints :