3x+6y+5y-2y
Combine like terms
3x+9y
Answer=3x+9y
2y = 2x + 12
y = -2x - 3
You have the value of y in the second equation
So you can substitute it in the first equation and find the value of x
2(-2x - 3) = 2x + 12
2(-2x) - 2(3) = 2x + 12
-4x - 6 = 2x = 12
You can add 6 to both sides and subtract 2x from both sides to find x
-4x - 6 + 6 = 2x + 12 + 6
-4x = 2x + 18
-4x - 2x = 2x - 2x + 18
-6x = 18
Divide both sides by -6
x = -3
Substitute x in equation (2) to find y
y = -2(-3) -3
y = 3
The solution is (-3, 3)
What is the mean of this data set? If necessy, round your answer to the nearest tenth. 12,16,22,23,34,44,46,47,48,64,67,73,83,88
Dmitry_Shevchenko [17]
The mean for the data set is 50.4
Rounded to the nearest 10th is 50
5.75a + 6.5c = 53.25
a + c = 9
c = 9 - a
5.75a + 58.5 - 6.5a = 53.25
5.25 = 0.75a
a = 7
7 + c = 9
c = 2
she bought 7 apple pies
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