20. Find X and Y from the following.
140°
X
Y
Answers
Answered by
0
Answer:
Answer
Given that: n=10
∑x=50,∑y=−30
∑x
2
=290,∑y
2
=300,
∑xy=−115
Formula :
=
n∑x
2
−(∑x)
2
.
n.∑y
2
−(∑y)
2
n∑xy−∑x.∑y
r=
10×290−(50)
2
.
10×300−(−30)
2
[10×(−115)]−[50×(−30)]
=
2900−2500
.
3000−900
−1150+1500
=
400
.
2100
350
=
20×10
21
350
=
4
21
7
=0.381.
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Answered by
0
Answer:
X + Y = 140. (1)
X - Y = 14 (2)
Adding equation 1 and 2.
x. +. y. = 140
x. - y. = 14
2x = 154
x =. 77
putting the value of x in (2)
77. - y. =. 14
-y. = - 63
y. = 63
hence the value of x and y is 77 and 63
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