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Write the equation of the that passes through (1,5) and (-2,14) in slope-intercept form

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ghanami

Hello : let  A(1;5) and B(-2;14)
the equation is y = ax+b   .... a is a slope
a = (yb -ya)/(xb -xa)
 a = (14-5)/(-2-1)
a = -3
 y = -3x+b 
A passes through  the line :  5 =-3(1)+b .....         b = 8
y = -3x+8


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