
Y = mx + b is the equation of a straight line and it is also known as slopeintercept form. Here, x, y are the coordinates, m is the slope of the line and b is the yintercept. Slope of the line, m = $\frac{change \ in \ value \ of \ y}{change \ in \ value \ of \ x}$ Plug in the slope and yintercept value into the Y = mx + b calculator and get the equation of a line. 
Step 2 : Apply those values into the formula, $y = mx + b$ and get the equation of a line. Here are the problems based on Y= mx + b below.
Solved Examples
Question 1: Find the equation of a line whose slope is 2 and yintercept is 1.
Solution:
Step 1 : Given :
Slope of line, m = 2
yintercept, b = 1
Step 2 : Equation of line is,
$y = (2)x + (1)$
$y = 2x  1$
Therefore, the equation of line is $y = 2x  1$.
Solution:
Step 1 : Given :
Slope of line, m = 2
yintercept, b = 1
Step 2 : Equation of line is,
$y = (2)x + (1)$
$y = 2x  1$
Therefore, the equation of line is $y = 2x  1$.
Question 2: Find the equation of a line whose slope is 4 and yintercept is 2.
Solution:
Step 1 : Given :
Slope of line, m = 4
yintercept, b = 2
Step 2 : Equation of line is,
$y = (4)x + (2)$
$y = 4x  2$
Therefore, the equation of line is $y = 4x  2$.
Solution:
Step 1 : Given :
Slope of line, m = 4
yintercept, b = 2
Step 2 : Equation of line is,
$y = (4)x + (2)$
$y = 4x  2$
Therefore, the equation of line is $y = 4x  2$.