What is (4, 169) and (10, 385) in slope intercept form?

1 Answer
Jun 15, 2017

Answer:

See a solution process below:

Explanation:

First, we need to determine the slope of the line running through the two points. The slope can be found by using the formula: #m = (color(red)(y_2) - color(blue)(y_1))/(color(red)(x_2) - color(blue)(x_1))#

Where #m# is the slope and (#color(blue)(x_1, y_1)#) and (#color(red)(x_2, y_2)#) are the two points on the line.

Substituting the values from the points in the problem gives:

#m = (color(red)(385) - color(blue)(169))/(color(red)(10) - color(blue)(4)) = 216/6 = 36#

The slope-intercept form of a linear equation is: #y = color(red)(m)x + color(blue)(b)#

Where #color(red)(m)# is the slope and #color(blue)(b)# is the y-intercept value.

We can substitute the slope we calculated for #m# and the values from one of the points can be substituted for #x# and #y# and we can solve for #b#:

#385 = (color(red)(36) * 10) + color(blue)(b)#

#385 = 360 + color(blue)(b)#

#-color(red)(360) + 385 = -color(red)(360) + 360 + color(blue)(b)#

#25 = 0 + color(blue)(b)#

#25 = color(blue)(b)#

#color(blue)(b) = 25#

We can now substitute the slope and value for #b# we calculated into the formula to obtain the formula for the line:

#y = color(red)(36)x + color(blue)(25)#