Working together, the job takes x hours to do.
If a lawn can be mowed with a push mower is 2 hours, then in 1 hour, you do 1/2 of the job.
If the same lawn can be mowed with a riding mower in 1 hour, then in 1 hour you do 1 job.
If the same lawn can be mowed by the two mowers together in x hours, then in 1 hour you get 1/x done.
1/2 + 1 = 1/x
3/2 = 1/x
x = 2/3
They take 2/3 of an hour. 2/3 * 60 min = 40 minutes.
No solution
to eliminate a variable you need to multiple the second equation by either a 3 and then subtract the two equations or by a -3 and add the two equations.
after changing it, instead of eliminating only one variable, both variables are eliminated and there is no solution
i hope this makes sense, not sure how else to explain
Answer:
distributive property of multiplication over addition
Step-by-step explanation:
hope this helps! :)
Find how fast she runs 1 km:
18/2 = 9 minutes.
So we know have K = 9t
Subtract 18 from both sides:
K-18 = 9t -18
Rewrite the right side:
K-18 = 9(t-2)
