Allow me a few minutes to read the problem properly and then we'll start.
Step 1
Calculate the slope of the line
we ahve the points
L(-3,-3) and N(4,1)
m=(1+3)/(4+3)
m=4/7
the slope is positive
so
that means
the slope points up and right
answer is option third
step 2
Determine the run for triangle CDE
we have that
slope=rise/run
we have
slope=4/7
rise=DE=5+7=12
so
4/7=12/run
run=7*12/4
run=21 units -----> is ok
Please, Do you understand all the steps so far?
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