1. The answer for the first question is 7.6 You get the answer by adding all the numbers together then dividing the answer you get by the number of items in this case there were 5 different numbers. This is how you get the mean.
2. The answer is 92.25
NQS= 30
you just subtract 78-48 to get 30
I think #7 may be either A or B
You have to gather like terms. for example numbers with the same letter go together. when you gather them, as the number with the letter move across the equal sign, they change operation. for example,
becomes
Answer:
x = -2, y = -(10/7)
Step-by-step explanation:
-3x + 3 = 9 ---------- equation 1
12x - 7y = -14 --------equation 2
from equation 1
-3x + 3 = 9
collect like terms
-3x = 9 - 3
-3x = 6
dividing both sides by -3
x = -2
substitute x = -2 into equation 2
12x - 7y = -14
12(-2) - 7y = -14
-24 - 7y = -14
collect like terms
-7y = -14 + 24
-7y = 10
divide both sides by -7
y = -(10/7)
therefore x = -2, and y = -(10/7)
