I am having some troubles. Please help?

Question

determine which two equations represent parallel lines.
a.) y=5/9x+2
b.)y=9/5x+5
c.)y=9/5x-5
d.)y=-5/9x+5
I think that it is c and d but I keep getting cought up and cannot work the problem all of the way through.

Thanks for the help!!!!!!

Answer 1

Parallel Lines have equal slopes.
These four equations are in the slope-intercept form y = mx + b, with m being the slope

So look for two equations with the same m-value in front of the x

Therefore, you'll see that b. and c. are parallel.

Answer 2

All the equation use this formulae :

y=mx+c, where m is the slope/gradient of the equation. To determine which is parallel to another equation, the m MUST BE THE SAME!!!

So, the m of the equations are :
a)5/9
b)9/5
c)9/5
d)-5/9

Thus, b) is parallel to c).

No working is needed!!!

Answer 3

Parallel lines have equal slope determined by the constant that multiplies x. In your case b. and c. have equal constant 9/5 so they are parallel.

Answer 4

the fomula for a linear graph is y=mx + c. m is the gradient and c is the y intercept. for the 2 graphs (lines) to b parallel, they have to share the same gradient. the answer is b and c, as their gradients are the same - both 9/5.

Answer 5

the parallel lines have sme slopes.so b and c is ur answer where m,slopei.e.,9/5 is same. the parllel lines differ only by their y intercepts.

Answer 6

Yeah. band c. The equations are already in slope-intercept form. Only difference are the y-intercepts.

Answer 7

In addition to the previous comments, note that perpendicular lines have gradients that multiply to -1. So c and d are in fact perpendicular (as are b and d).

Answer 8

b and c... one is subtract the other add... lol: but its b n c

Answer 9

c and b