Question

Write the equation of the line that passes through the given point and has the given slope:

Answer 1

Answer:

y=4x-21

Step-by-step explanation:

y-y1=m(x-x1)

y-(-21)=4(x-0)

y+21=4(x)

y+21=4x

y=4x-21

Answer 2

Answer:

$\displaystyle 4x - y = 21, -4x + y = -21, or\:y = 4x - 21$

Step-by-step explanation:

In this case, the y-intercept and rate of change [slope] are given to us, so just put it in Slope-Intercept Form:

$\displaystyle y = 4x - 21$

If you want it in Standard Form:

y = 4x - 21

- 4x - 4x

_________

$\displaystyle -4x + y = -21\:OR\:4x - y = 21$

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