if 2x +y = 23 and 4x -y =19 find the value of x- 3y and 5y -2x
Answers
Step-by-step explanation:
4x -y = 19
+ 2x +y = 23
-----------------
6x = 42
x = 42/6 =7
2x + y = 23
2(7) + y = 23
14 + y = 23
y = 23 - 14
y = 9
x - 3y
=7 - 3(9)
=7 - 27
= - 20
5y - 2x
= 5(9) - 2 (7)
= 45 - 14
= 34
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Answer:
let 2x + y = 23 (i)
4x - y = 19 (ii)
We adding equation (I) and (ii)
2x + y = 23
4x - y = 19
__________
6x = 42
x = 42/6
x = 7
puting this value in equation (I)
2x +y = 23
2.7 + y = 23
14+ y = 23
y = 23 - 14
y = 9
according to Question fine the value of
Q. x - 3 y.
7 - 3× 9
7- 27
20
Q. 5y - 2x
5.9 - 2.7
45 - 14
31