Answers

2014-11-10T21:37:26+08:00
Slope formula is given as:
m = \frac{y_2-y_1}{x_2-x_1}
1.)
 \frac{1}{4} =  \frac{a-(-3)}{2-4}
2-4 = 4(a+3)
-2 = 4a + 12
4a = -2-12
4a = -14
a = - \frac{14}{4}
or
a = - \frac{7}{2}

2.)
4 =  \frac{(a-2)-5}{1-(a+3)}
4 =  \frac{a-7}{-a-2}
4(-a-2) = a-7
-4a - 8 = a-7
-8 + 7 = a + 4a
5a = -1
a = - \frac{1}{5}
1 4 1