solve the following simultaneous equation:
x + 7y = 10. (1)
3x - 2y = 7. (2)
Answers
Answered by
3
Hey mate here is your answer
x=10-7y (1)
x=(7-2y)/3. ( 2)
subtract eq 2 by 1
0=(7-2y)/3-{10-7y}
3=7-2y-10+7y
3=-3+5y
5y=3+3
y=6/5
put y value in eq 1
x=10-7(6/5)
x=10-35/5
x=50-35/5
x=15/5
x=3
hope it will help you
x=10-7y (1)
x=(7-2y)/3. ( 2)
subtract eq 2 by 1
0=(7-2y)/3-{10-7y}
3=7-2y-10+7y
3=-3+5y
5y=3+3
y=6/5
put y value in eq 1
x=10-7(6/5)
x=10-35/5
x=50-35/5
x=15/5
x=3
hope it will help you
RishiChaudhary:
why
according to my text book
what is answer
x=3
y=1
no y can't be 1
i don't know
but
because then value of x wouldn't be 3
thanks for trying mate
Answered by
3
Answer:
x+7y=10------eq.1
3x-2y=7------eq.2
Multiply eq.1 by 3
We get,
3x+21y=30------eq.1
3x-2y=7----------eq.2
Now,add eq.2&1
We get,
23y=23
y=1
Substitute y=1 in eq.1,
We get,
x+7y=10
x+7×1=10
x+7=10
x=10-7
x=3
(x,y)=(3,1)
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