Solve using the substitution method.
2x – y = –20
y = –2x
a. (–5, 10)
b. (–3, 6)
c. no solution
d. (–8, 16)

option A

Step-by-step explanation:

2X-Y=20

2X-(-2X)=-20

2X+2X=-20

4X=-20

X=-20/4=-5

So we have: Y= -2(-5)=10

Step-by-step explanation:

omg what happend to your question? if you could edit this question i can

step-by-step explanation:

54 km / hours

step-by-step explanation:

we need to convert seconds to hours

60 seconds = 1 minutes

60 minutes = 1hour

15 m         60 second   60 minutes

  * *         = 54000 meters/ hour

second     1 minute             1 hour

now we need to convert meters to km

1000 m = 1 km

54000 m       1 km

*   = 54 km / hours

hour               1000m