nagdy1
What is an equation for the line that passes through points (–1, –4) and (1, 4)? Write the equation in slope-intercept form. PLEASE SHOW STEP BY STEP
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philo1234
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First find the slope using the 2 point can you do that?
nagdy1
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yes
philo1234
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What did you get?
nagdy1
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zero slope or unidentified slop
philo1234
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\[slope = \frac{ 4-(-4) }{ 1-(-1) }\]
nagdy1
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that's all
philo1234
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Nope you then need to use this slope and one of the points to find the equation.
plug in this formula y-y1=m(x-x1) (x1,y1) is taken from one of the points
nagdy1
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ok then what
nagdy1
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i dont get my head is about to explode they gave me this question out of no where
nagdy1
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can u show me step by step
philo1234
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So what do you have so far?
m (slope)=4, choose the point (1,4), x1=1, y1=4
you should have y-4=4(x-1)
nagdy1
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can you please just put all the steps on one reply like: 1. 2. 3. 4.
philo1234
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Step 1: Find the slope(m) = (4-(-4))/(1-(-1))
= 8/2=4
nagdy1
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ok step 2
philo1234
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Step 2: Use point slope form to get equation: y-y1=m(x-x1), m=4, point (1,4) where x1=1, y1=4
In the point-slope equation: y-1=4(x-4)
Do u understand these step so far?
nagdy1
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yes
philo1234
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Step 3: Slope-intercept form is y=mx+b
So we have y-1=4(x-4)
Solve for y (that is put y by itself on one side).
philo1234
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If you did that correctly you should get: y=4x-15
nagdy1
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ohhh thanks man
nagdy1
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ill give u a medal
philo1234
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Sure no problem.