Greetings from Brasil...
We have 2 ways to solve:
1 - through the expression of the slope m (attached figure 1)
2 - determinat (attached figure 2)
1:
m = ΔY/ΔX
as m = 1, as stated in the statement, then
1 = (- 9 - w)/(-6 - 10)
w = 7
check attachments
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