Answer:
Step-by-step explanation:if ab it s 13 and bc is 21 that means you simplified that and you will get 34
8x-5y because 7x plus x is 8x and -6y+y is 5y
Here you go, learn from this child.
Answer:
24
Step-by-step explanation:
18/n = 21/28 You can cancel, but calculators make that unnecessary. Cross multiply
21n = 18 * 28
21n = 504 Divide by 21
n = 504 / 21
n = 24
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12/16 = n / 64 Cross Multiply
16n = 12 * 64
16n = 768 Divide by 16
n = 768/16
n = 48
So I believe you go

and substitute x an y like this
(1-7) (7-1)
and get a slope of -9/6
Sorry If I got it wrong,but I hope I helped