2x-3y = 12 and x divide by x+y = 5/7 what is the value of x-2y
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Answer:
3
Step-by-step explanation:
x/x+y=5/7
on cross multiplication
7x=5x+5y
7x-5x=5y
2x=5y
x=5y/2
Now 2x-3y=12
substituting x=5y/2 above we get
2(5y/2)-3y=12
5y-3y =12
2y =12
y=6
now x=5y/2
x= 5*6/2=15
therefore x-2y= 15-2(6)= 15-12= 3
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