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What is the slope-intercept form of the equation of a line that passes through (5, -4) and has a slope of `3/4`?

A.
`y = -(3)/(4) x -(1)/(4)`

B.
`y = 3/4 x +(1)/(4)`

C.
`y = 3/4 x -(31)/(4)`

D.
`y = 3/4 x +(31)/(4)`

1 Answer

1 vote

Your answer would be C. y = (3/4)x - 31/4


We can find this first by using the slope we are given to write the equation y = (3/4)x + c. Then, we can substitute in the coordinates and solve:


-4 = (3/4 × 5) + c

-4 = 15/4 + c

- 15/4

-4 - 15/4 = c


To do this subtraction, we must first write -4 as -4/1, and then get it over 4 by multiplying by 4, so we get the fraction -16/4.


Then we can do -16/4 - 15/4 = -31/4, which is your y-intercept.


This makes the final answer y = (3/4)x - 31/4.


I hope this helps!



User Mellamokb
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