kirstenb278
21.08.2019 •
Mathematics
What is the 12th term in the addition pattern with formula 6n – 7?
a.
59
b.
65
c.
71
d.
72
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Ответ:
a(12) = 6(12) - 7
a(12) = 72 - 7
a(12) = 65
The answer is B.
Ответ:
C. (-1, 3)
Step-by-step explanation:
Label the 2 equations:
5y= 7x +22 (1)
x= -6y +17 (2)
Substitute (2) into (1):
5y= 7(-6y +17) +22
5y= -42y +119 +22 (Expand bracket)
5y= -42y +141 (Simplify)
42y +5y= 141 (+42y on both sides)
47y= 141
y= 141 ÷47 (÷47 on both sides)
y= 3
Substitute y= 3 into (2):
x= -6(3) +17
x= -18 +17
x= -1
Thus, the solution is (-1, 3).