Iriatobio
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The equation of a line is given by 2(y+1)=4(x−a)+3
2(y+1)=4(x−a)+3
If the
y-intercept is6.5, find the value of a
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laurawatt
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What have you done so far?
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laurawatt
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(Original post by Iriatobio)
The equation of a line is given by 2(y+1)=4(x−a)+3
If the
y-intercept is6.5, find the value of a
To give you a starting point if you’re completely stuck, expand both brackets
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Iriatobio
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(Original post by laurawatt)
To give you a starting point if you’re completely stuck, expand both brackets
ok, thank you but where do you put the y- intercept?
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laurawatt
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(Original post by Iriatobio)
ok, thank you but where do you put the y- intercept?
So once you’ve expanded out and simplified, the y-intercept is the bit that doesn’t have any x’s or y’s in it - then set that bit equal to 6.5 to find a

For example in y=5x-8 , the y-intercept is -8 (when x=0, the value of y is -8)
Another example: y=4x+b-3 <- here the y intercept is b-3 as when x=0, y=b-3
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Iriatobio
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(Original post by laurawatt)
So once you’ve expanded out and simplified, the y-intercept is the bit that doesn’t have any x’s or y’s in it - then set that bit equal to 6.5 to find a

For example in y=5x-8 , the y-intercept is -8 (when x=0, the value of y is -8)
Another example: y=4x+b-3 <- here the y intercept is b-3 as when x=0, y=b-3
ok perfect thank you
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laurawatt
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(Original post by Iriatobio)
ok perfect thank you
No problem happy to check your answer if you want
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Iriatobio
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is the answer -3 then?
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