anonymous
  • anonymous
Given that the line Ax+By+10=0 is parallel to the line 3x+y=7 and meets the line x+4=7 on the x-axis, find the value of A and B..??
Mathematics
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
How do i do this??
anonymous
  • anonymous
@mathmate @jim_thompson5910
anonymous
  • anonymous
do u know??

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More answers

jackthegreatest
  • jackthegreatest
maybe...
jackthegreatest
  • jackthegreatest
since the lines r parallel, the slope is -3
jackthegreatest
  • jackthegreatest
so A is 3
anonymous
  • anonymous
wait how A=3
jackthegreatest
  • jackthegreatest
because the line is parallel to 3x + y= 7 parallel lines have the same slope
jackthegreatest
  • jackthegreatest
B is 1
jackthegreatest
  • jackthegreatest
so a=3 and b = 1
jackthegreatest
  • jackthegreatest
there r ur answers : )
anonymous
  • anonymous
r u sure??
jackthegreatest
  • jackthegreatest
yes i am sure, of course i am
anonymous
  • anonymous
@jim_thompson5910
jim_thompson5910
  • jim_thompson5910
jackthegreatest is correct
anonymous
  • anonymous
so we take the slope and use it for A?
jim_thompson5910
  • jim_thompson5910
Anything parallel to Ax+By+10=0 will be of the form Ax+By = C where C is some fixed number Using numbers anything parallel to 3x+y=7 will be in the form 3x+y = C
anonymous
  • anonymous
ok and since y=1 we use that for B?
jim_thompson5910
  • jim_thompson5910
the coefficient for y is 1, yes
anonymous
  • anonymous
ok
anonymous
  • anonymous
so if we had 4x+5y=7 then A=4 and B=5?
jim_thompson5910
  • jim_thompson5910
yeah because the left side of a standard form equation stays the same when you have parallel lines
anonymous
  • anonymous
ok thank u both.. @jackthegreatest and @jim_thompson5910
jim_thompson5910
  • jim_thompson5910
np
jackthegreatest
  • jackthegreatest
np

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