3x + y = 3
7x + 2y = 1
First isolate one of the variables (x or y) in one of the equations.
Isolate "y" in the first equation(because it is the easiest to isolate) and substitute it into the second equation.
3x + y = 3 Subtract 3x on both sides
3x - 3x + y = 3 - 3x
y = 3 - 3x
7x + 2y = 1
7x + 2(3 - 3x) = 1 [since y = 3 - 3x, you can substitute (3-3x) for "y"]
Multiply/distribute 2 into (3 - 3x)
7x + (3(2) - 3x(2)) = 1
7x + 6 - 6x = 1
x + 6 = 1 Subtract 6 on both sides
x = -5
Now that you know "x", substitute it into one of the equations (I will do both)
3x + y = 3
3(-5) + y = 3 [since x = -5, you can plug in -5 for "x"]
-15 + y = 3 Add 15 on both sides
y = 18
7x + 2y = 1
7(-5) + 2y = 1
-35 + 2y = 1 Add 35 on both sides
2y = 36 Divide 2 on both sides
y = 18
x = -5, y = 18 or (-5, 18)
Answer:
Mean = 50
Step-by-step explanation:
<em>Step 1: Write the mean formula</em>
Mean = sum of data/ total number of data
<em>Step 2: Calculate the sum of data</em>
35 + 40 + 45 +50 + 55 + 60 + 65 = 350
<em>Step 3: Find the total number of data</em>
Total number of data = 7
<em>Step 4: Calculate the mean</em>
Mean = sum of data/ total number of data
Mean = 350/7
Mean = 50
Therefore, the mean of this data is 50.
!!
Answer:
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Step-by-step explanation:
