carlenstar281
Please help me I don't understand?? study guide :(
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carlenstar281
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what are the coordinates of the x- intercept of the line 3x4y=12
carlenstar281
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I know what the answer is (4,0) but why?
hartnn
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to get x-intercept, put y=0 in line 3x+4y=12
jim_thompson5910
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like hartnn is saying
3x+4y=12
3x+4(0)=12 ... plug in y = 0
3x + 0 = 12
3x = 12
x = 12/3
x = 4
So the x-intercept is the point (4,0)
jim_thompson5910
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to find the y-intercept, just plug in x = 0 and solve for y
carlenstar281
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Thank you Thank you for your help :)
carlenstar281
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do you mind giving me a practice problem? So I can figure it out myself i really appreciate it
jim_thompson5910
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find the y-intercept of 5x + 10y = 30
carlenstar281
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just make up one please :)
hartnn
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to get y-intercept, put x=0 in 5x+10y=30
carlenstar281
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since my test is multiple choice can you give me answers to choose from?
hartnn
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not required, but sure,
1) (0,-3)
2) (0,3)
3) (3,0)
4) (0,6)
hartnn
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having problems ?
carlenstar281
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yes i got x=10?
carlenstar281
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I suck at math
hartnn
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how you can get x=10 when i told you to put x=0 to find y-intercept :O
carlenstar281
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i have no idea why
carlenstar281
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one sec
hartnn
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|dw:1362727211824:dw|
hartnn
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can you find y from 5(0)+10y=30 ?
carlenstar281
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sorry i got it though it would be (3,0) yes
hartnn
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you got y=3 then, right ??
and intercepts are of the form (x,y)
y co-ordinate comes after comma
so, would you like to revise your answer ?
carlenstar281
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yes its (0,3)
hartnn
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now its correct :)
hartnn
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want more examples?
carlenstar281
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yes please and thank thank you for helping me :)
carlenstar281
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I actually understand it now!!
hartnn
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oh, you are welcome :)
find x intercept of the line 2x+3y = 7
this involves fraction....
hartnn
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try first without choices
carlenstar281
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okay ill try it :)
carlenstar281
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okay i know this is wrong but is it (0, 2 1/3)
jim_thompson5910
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to find the x-intercept, you plug in y = 0
not x = 0
hartnn
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to get x-intercept, you need to put y=0, right ?
carlenstar281
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oh wow okay one sec sorry its late
hartnn
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no problem, take your time :)
carlenstar281
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alright is it (0, 3 1/2) btw thanks for your patience math is just really not my subject :/
jim_thompson5910
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2x+3y = 7
2x+3(0) = 7 ... plug in y = 0 (not x = 0)
2x + 0 = 7
2x = 7
x = ???
hartnn
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x=3 1/2 is correct, but same note again,
intercepts are of the form (x,y)
x co-ordinate comes before comma
so, would you like to revise your answer ?
carlenstar281
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No way i got it right and yes :) (3 1/2,0)
hartnn
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yes, now (3 1/2,0) is correct :)
carlenstar281
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Thanks again for all your help Im going to go to sleep so i can get up tomorrow again i cant thank you enough you really helped me understand this I know I will ace that test now Thank you!! :)
hartnn
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i am glad to hear that :) and you are most welcome ^_^