Respuesta :

texaschic101
y = mx + b....(5,6)
slope(m) = 5
now we sub
6 = 5(5) + b
6 = 25 + b
6 - 25 = b
- 19 = b

so ur equation is : y = 5x - 19...now we sub in 21 for x
y = 5(21) - 19
y = 105 - 19
y = 86

so when x = 21, y = 86
meerkat18
Determine the equation of the line using the given slope and point by,
                            y - y1 = m(x - x1)
Substitute the values,
                           y - 6 = 5(x - 5)
Simplifying the equation,
                             y = 5x - 19
Substituting the given value of x given,
                             y = 5(21) - 19 = 86
Therefore, the answer is 86.