find the value of x and y if 5x+8y=-1 and 6y-x=4y-7
Answers
Answered by
1
Answer:
X = 3 & Y = -2
Step-by-step explanation:
Given,
5x + 8y = -1 ------------> (1)
6y - x = 4y - 7
=> x - 6y + 4y - 7 = 0
=> x - 2y = 7 ----------> (2)
(1) ==> 5x + 8y = -1
(2) x 4 ==> 4x - 8y = 28
---------------------
9x = 27
---------------------
==> x = 3
(1) ==> 5x + 8y = -1
==> 5(3) + 8y = -1
==> 15 + 8y = -1
==> 8y = -1 - 15
==> 8y = - 16
==> y = -2
Answered by
1
Step-by-step explanation:
6y-x=4y-7
2y-x= -7.
multiplying equation 1 with 5 we get
5(2y-x) =5× -7
10y-5x = -35. (1)
5x+8y = -1. (2)
(1)+(2)
10y-5x+5x+8y = -35+-1
10y+8y = -36
18y = -36
y = -2
putting y = -2 in equation (2)
we get
5x+8(-2) = -1
5x+ -16 = -1
5x = 15
x= 3
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