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two ways :

1. calculate the slope of the two lines, if it is same, they are parallel.

2. draw a perpendicular line ( 90 degrees) from on of the lines and if it intersects the other line at 90degrees then they are parallel

-HD

Q: How do you tell if lines on a graph are parallel?

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they need to look parallel

Parallel lines don't intersect, no matter how many of them there are.

Lines drawn parallel to the axes have only one letter.y=5 is horizontal, parallel to the x-axisx=5 is vertical , parallel to the y-axis.

If you can find the slope of both lines, then yes you can tell. The slope for parallel lines is the same - so if your slopes are the same, your lines are parallel. If you are measuring (less exact) the lines will be the same distance apart everywhere.

infinitely many solutions :)

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they need to look parallel

Parallel

Parallel lines don't intersect, no matter how many of them there are.

Correct. Unless the parallel lines are coincident, in which case the solution set is the whole line.

The difference between intersecting and parallel lines is that, on a graph parallel lines do ont touch,cross or anything. THEY NEVER TOUCH. intersecting lines touch, or cross eachother.\

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correlation

Lines drawn parallel to the axes have only one letter.y=5 is horizontal, parallel to the x-axisx=5 is vertical , parallel to the y-axis.

If you can find the slope of both lines, then yes you can tell. The slope for parallel lines is the same - so if your slopes are the same, your lines are parallel. If you are measuring (less exact) the lines will be the same distance apart everywhere.

The transversal is the line that cuts the parallel line.

Grid

infinitely many solutions :)