Math ... need help: Slope and Y-intercept?

Question

If the slope of a line is -4/7 and a point on this line is (2,8), what is the y-intercept of this line?

Answer 1

slope is -4/7

so equation of line is y = -4/7 x + c

or 7y = - 4 x + C ( where C = 7c)

as 2,8 is a point on line

7 * 8 = - 4*2 + C or C = 64

so 7y = -4x + 64

fot the y intecept x = 0 so

7y = 64 or y = 64/7

Answer 2

first math terms : slope is the gradient and the symbol is m

                         y- intercept is called C

and the equation of a straight line is y=mx + c

so u jst replace wat u hv

8 = -4/7 (2) + C

8+8/7 = c

56/7 + 8/7 = c

64/7 = c  

Answer 3

you have,

y =8

x =2

slope (m) = -4/7

y intercept (b) = ?

in linear eq. : y = mx + b

so,

8 = (-4/7)* 2 + b

8 + (8/7) = b

b = 64/7

so y intercept = 64/7  

Answer 4

(y-8)/(0-2) = -4/7

=> y = 9 1/7