First : -(-6) will turn into a positive 6
second: -8+6 which equals -2
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so hmm the idea behind the elimination, is to make the value atop or below, of either variable, the same but with a negative sign
so hmmm say... we'll eliminate "y"
so... let's see, we have 2y and 5y, both positive
what do we multiply 2y to get a negative -5y, that way, -5y +5y = 0 and poof it goes
well let's see, let's try "k"

so.. if we multiply 2y by -5/2, we'll end up with -5y
well, let's multiply that first equation then by -5/2

so.. now we know x = 1.... so let's plug that in say hmmm 2nd equation
Answer:
The rate of change is of 2.25 degrees per hour.
Step-by-step explanation:
The rate of change in degrees per hour is given by by the change in temperature divided by the change in time(by number of hours).
In this question:
From 6 am to 2 pm, there are 12 - 6 + 2 - 0 = 6 + 2 = 8 hours
The change in temperature was of 76 - 58 = 18º
Rate of change:
18º/8 = 2.25º
The rate of change is of 2.25 degrees per hour.
Remember
a/b times c/d=(ac)/(bd)
basically
x/y times c/d such that x times c=8 and y times d=15
exampes
8/1 times 1/15
2/1 times 4/15
4/1 times 2/15
8/3 times 1/5
2/3 times 4/5
4/3 times 2/5
8/5 times 1/3
2/5 times 4/3
4/5 times 2/3