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12 votes
12 votes
A line is parallel to y = 5x + 3 and

intersects the point (3, 9).
What is the equation of this
parallel line?
y = 5x + [?]

User Brijesh Joshi
by
2.5k points

1 Answer

14 votes
14 votes

Answer:

y = 5x - 6

Explanation:

1. In a linear equation, it is represented by y = mx + b

2. A line parallel to another has the same slope (m) but a different y-intercept (b)

3. So we know that it is y = 5x as the first half. However, we need to find the new y-intercept.

4. Let's plug in the point we know into the equation, and see what amount we are missing (the y-intercept)

5. y = 5(3)

6. y = 15, however, we know that y = 9. That's a difference of -6.

This shows us that the y-intercept is -6 making the full equation:

y = 5x - 6

We can check by putting the point back into the equation:

y = 5(3) - 6

y = 15 - 6

y = 9

This correlates with the original point, we have solved the equation.

User Kyriaki
by
2.9k points