Maths question.. Find value of k
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Maths question.. Find value of k

[From: ] [author: ] [Date: 11-10-29] [Hit: ]
x had to equal 0? but i think i may be abit confused there.. can anyone help?B[-5, 15]-pretty certain that you are right about y=K=15,......
Point A [3, -1] and B [-5, K]
The line AB has equation y=5-2x

For this i subbed in -5 to the equation and found that y = 15 but then i remembered that to find y, x had to equal 0? but i think i may be abit confused there.. can anyone help?

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y = -2x + 5

the slope of the line is -2

(K - (-1)) / (-5 - 3) = -2

(K + 1) / -8 = -2

K + 1 = 16

K = 15

B[-5, 15]

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pretty certain that you are right about y=K=15, because you have the equation of the line already so you should be able to plug any value in and get the other part of any given point
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