Linghong C. answered • 10/23/12

Experienced Math tutor

**Using slope-intercept form y=mx+b to solve a and b (m is slope, b is the y-axis intercept)**

a) m=3/2, b=4,

plug in: y = (3/2)x + 4

b) first solve the slope m

m=(y_{2}-y_{1})/(x_{2}-x_{1}), two poits (3,-4) (0,4) , you get the slope: (4-(-4))/(0-3)=-8/3

b is the y-axis intercept. So b is the y number when x=0, from point(0,4), we know b=4

solve the equation: y=(-8/3)x+4

**using the point slope form of the equation of a straight line: y-y _{1}=m(x-x_{1}) to slove c**

c) point (-2.5, 4) slope m=2

plug in: y-4= 2 (x-(-2.5))

y-4=2x+5

y=2x+9

Tracy K.

Yes you did thank you very much!! :)10/23/12