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5 votes
Solve by substitution

x/2+y/5=4/5
x/6-y/5=5/6​

1 Answer

4 votes

Answer:


x=(49)/(20),
y=-(17)/(8)

Explanation:


\left \{ {{(x)/(2)+(y)/(5)=(4)/(5)} \atop {(x)/(6)-(y)/(5)=(5)/(6)}} \right.


(x)/(2)+(x)/(6)=(4)/(5)+(5)/(6)


(6x)/(12)+(2x)/(12)=(24)/(30)+(25)/(30)


(8x)/(12)=(49)/(30)


240x=588


x=(49)/(20)


(x)/(2)+(y)/(5)=(4)/(5)


((49)/(20))/(2)+(y)/(5)=(4)/(5)


(49)/(40)+(y)/(5)=(4)/(5)


(49)/(40)=(4-y)/(5)


245=160-40y


85=-40y


y=-(17)/(8)

User Biggsy
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