Select the correct answer from each drop-down menu. A system of equations and its solution are given below.
System A
x - y = 7
-3x + 9y = -39
Solution: (4,-3)
Complete the sentences to explain what steps were followed to obtain the system of equations below.
System B
x - y = 7
6y = -18
To get system B. the (second/first)
equation in system A was replaced by the sum of that equation and (-3, -9, 9, 3) times the (second/first)
equation. The solution to system B (is not/ is)
the same as the solution to system A

mk./km: lm

step-by-step explanation:

,mlmlm

; mk

lk

d

step-by-step explanation:

hello and welcome!

so, when we see the words "proportional" along with a table, we need to know that we're looking numbers that divide by the same thing.

looking at this table, we simply have to do a trial and error, and divide to see which numbers have the same quotient. if you look at choice a & c, they both have equal quotients for three of the numbers, with one exception, so those can't be the answer. looking at b, there is no similarity, so that can't be it. then, we see d; if you divide all the numbers in the table, you'll see that they all divide by two, which is a proportional relationship, and our answer!

also, always remember that the x will always be the number that goes into y, and somewhere behind this table, is a formula. for this specific table, the formula would be:

since our x-value is being divided by two to get the y-value. and if they were to ask for more numbers in the series, this is the formula you would use to find them.

what is the graph

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