Pearson Algebra 1 Common Core, 2011
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Pearson Algebra 1 Common Core, 2011 View details
6. Parallel and Perpendicular Lines
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Exercise 11 Page 334

What do parallel lines have in common?

y=2/3x

Practice makes perfect
Consider the given equation of a line. y=2/3x+1 When lines are parallel, they have the same slope. Because of this, we know that all lines that are parallel to the line whose equation is given will have a slope of 23. We can write a general equation in slope-intercept form for these lines. y=2/3x+ b We are asked to write the equation of a line parallel to the given equation that passes through the point ( 0, 0). By substituting this point into the above equation for x and y, we will be able to solve for the y-intercept b of the parallel line.
y=2/3x+b
0=2/3( 0)+b
â–Ľ
Solve for b
0=0+b
0=b
b=0
Now that we have the y-intercept, we can write the parallel line to y= 23x+1 through (0,0). y=2/3x+ 0 ⇔ y = 2/3x