College
posted by Justin .
If the line passing through point (a,1) and (8,7) is parallel to the line passing through the points (4,9) and (a+2,1) what is the value of a?

since the slopes are the same,
6/(8a) = 8/(a2)
6a12 = 8a64
2a = 52
a = 26
Respond to this Question
Similar Questions

Algebra
I'm suppose to write an equation with the following information: Line passes through (2,6) and is parallel to x=8 I know i must use the slope point form the problem is that since x=8 I don not know which is the slope. Please help … 
adult education
Math If the line passing through the points (1,a) and (4,2)is parallel to the line passing through the points (2,8) and (7,a + 4), What is the value of a ? 
math
i have more than one question so if u no any of the answers please tell me 1.) write the pointslope form of the equation of the line with slope 2 passing through the point ( 5, 9). 2.) write the pointslope form of an equation … 
Calculus
Determine the equation of the line described by the given information. a) slope 2/3, passing through (0,6) b) passing through points (2,7) and (6,11) c) parallel to y=4x6 passing through point (2,6) 
Math
If the line passing through the points (a, 1) and (5, 7) is parallel to the line passing through the points (8, 8) and (a + 2, 1), what is the value of a? 
math
If the line passing through the points (a, 1) and (5, 7) is parallel to the line passing through the points (8, 8) and (a + 2, 1), what is the value of a? 
Pre Algebra
Given an equation of a line, how do I find equations for lines parallel to it going through specified points Simplifying the equations into slopeintercept form. 1. y= 2x 4; (1, 3) how do I write the equation of a line parallel to … 
Math
If the line passing through the points (a, 1) and (−2, 8) is parallel to the line passing through the points (12, 5) and (a + 2, 1), what is the value of a? 
Pre Calc
If the line passing through the points (a, 1) and (2, 8) is parallel to the line passing through the points (12, 6) and (a + 2, 1), what is the value of a? 
Algebra
I spent hours on this and I still cant figure it out please help me: Let L1 be the line passing through the points Q1=(4, 2, −3) and Q2=(5, 5, −5). Find a value of k so the line L2 passing through the point P1 = P1(3, 7, k) …