The y variable in both equations are opposites. So, we can add the two systems together to eliminate y and solve for x.
-4x + y = -10
6x - y = 16
2x = 6
2 × 3 = 6.
x = 3. Now we have to solve for y. Let's use 6x - y = 16.
6(3) - y = 16
18 - y = 16
18 - 2 = 16, so y = 2.
x = 3
y = 2.
Or if you have to put it in coordinate form: (3, 2)
<span>20: 1,2,4,5,10,20
45: 1,3,5, 9, 15,45
so five is the greatest common factor of 20 and 45x</span>
42,42,24,36,60,6
1st Find the mean X̅
=(42+42+24+36+60+6)/6 = 35
2nd find the difference between the data set value and the mean (x - X̅)
and square them:
(42-35)² = 49
(42-35)² = 49
(24-35)² = 121
(36-35)² = 1
(60-35)² = 625
(6-35)² = 814
Now add up te result ∑(x-X̅)² =1659
Http://mathsfirst.massey.ac.nz/Algebra/SystemsofLinEq/EMeth.htm this website explains it well
