
Nataliya D. answered 07/01/13
Patient and effective tutor for your most difficult subject.
1. Slope-intercept form of linear equation is
y = mx + b
2. The rational way to solve the given problem is to use the intercept form of a linear equation.
x y
— + — = 1
a b
(where (a , 0) are coordinates of the x-intercept
and (0, b) are coordinates of the y-intercept )
~~~~~~~~~~~
(-3, 0) ---> a = -3
(0, 4) ----> b = 4
x y
—— + —— = 1
-3 4
Let's multiply our equation by 12:
x y
12 • —— + 12 • —— = 12 • 1
-3 4
- 4x + 3y = 12
+ 4x + 4x
3y = 4x + 12
÷3 ÷3 ÷3
4
y = — x + 4
3