How do I find coordinate points that represent the x and y intercepts of the inear function y=-3x-5?
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when y= 0, what does x have to be?
when x = 0 what does y have to be?
answers could be (-5,0) and (0,-5/3), or (-5/3,0)and (0,-5), or (-5,0)and (-5/3,0), or (-5/3,0)and (-5,0)
there is only one answer :)
when y = 0 the equation looks like this:
0 = -3x -5 solve for "x"
when x = 0 the equation looks like this:
y = -3(0) -5
y = 0-5
y = -5 ; so when x = 0, what does "y" equal?
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1/5 ......? but why
no, wait, that can't be right. aaarrgh.
you write out what you are doing to solve it, and ill let you know where you are going astray..
I don't even know where to begin That's my problem.
you begin by plugging in a value of x=0 or y=0 into the equation and solving for the other variable.
x = 0 is usually a good be
another more simplistic manner is to get the equation into the form:
Ax + By = C
y=-3x-5 become 3x +y = -5
3(0) + y = -5 ; y = -5 (0,-5)
3x + 0 = -5
3x = -5
x = -5/3...... (-5/3,0)