A few days ago

Anonymous

Stuck on this math problem. Some help would be great. Thanks?

Write the equation of the line passing through each of the given points with the indicated slope.

Give your result in slope-intercept form, where possible.

a. (-1, 3) and (4, -2)

b. (2, -3) and (2, 4)

Top 3 Answers

A few days ago

Dominic D

Favorite Answer

a. a line has equations: y = mx + b (slope-intercept form)

slope: m = (y,final – y,initial) / (x,final – x,intial)

= ( – 2 – 3 ) / ( 4 – (-1) )

= -5 / 5

m = -1

choose one of the points to solve for b . …. (4, -1)

y = mx + b

(-2) = (-1)(4) + b ……… b = 2

answer: y = (-1) x + 2 or -x + 2

CHECK

at x=-1, does y = 3 (1st point)…

y = (-1)(-1) + 2 = 3 OK

b. slope is undefined (m = infinity),

so slope-int form not possible, but…equation is: x = 2

A few days ago

kristin124

Find the slope of both lines.

a) is -1

b) is undefined

You can only answer a) put it in y=mx+b form

A few days ago

malvon74

b) is the where x=2 and it doesn’t matter what y is. a horizontal line

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