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Which is an equation of the line through (-1, -4) and parallel to the line 3x + y = 5

a. y= -3x - 7
b. y= 3x +1
c. y= 3x -1
d. y= -3x +7

User Agatana
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1 Answer

2 votes

Answer:

A

Explanation:

Firstly, we need to understand that if two lines are parallel to each other, then their slope is equal

The general equation of a straight line can be represented by

y = mx + c

where m is slope and c is the y-intercept

Considering the line

3x + y = 5

y = 5-3x

Thus, the slope here is -3 and this is same as that of the line that passes through the point given

The equation of the given point looks like this;

y = c - mx

since our slope is negative

We need to get what c is, so this is the point the point comes in. We represent y by the y coordinate and x by the x coordinate

Thus:

-4 = c -3(-1)

-4 = c + 3

c = -4-3 = -7

The equation of the line is thus;

y = -3x - 7

User Ken Benoit
by
6.3k points