3x-4y+5=0 and 7x+8y+5=0 then what is the value of X and Y
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Answer:
x = -15/13 and y = 5/13
Step-by-step explanation:
3x - 4y + 5 = 0
3x - 4y = -5 --------(1)
7x + 8y + 5 = 0
7x + 8y = -5 --------(2)
on multiply by 2 in eq 1
2(3x - 4y = -5)
6x - 8y = -10 --------(3)
on adding eq 2 and 3
6x - 8y = -10
7x + 8y = -5
13x = -15
x = -15/13
put x in eq 1
3x - 4y = -5
3(-15/13) - 4y = -5
-45/13 - 4y = -5
-45/13 + 5 = 4y
(-45+65)/13 = 4y
20/13 = 4y
20/(13×4) = y
5/13 = y
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