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Mathematics
Carlie Shea
21 July, 05:55
10 (1+3x) = -20 and - 5x-8 (1+7x) = -8
With steps
+4
Answers (
1
)
Cash Santos
21 July, 07:46
0
(1)
10 (1+3x) = -20
Cross multiply.
10+30x=-20
Isolate x on one side. So you would subtract 10 on each side. and one side will cross each other out. leaving you with,
30x=-20-10
Subtract 10 from - 20.
30x=-30
Divide each side by 30 to get x.
30x:30=-30:30
Therefore,
x=-1
(2)
-5x-8 (1+7x) = -8
Cross multiply - 8 (1+7x)
-5x-8-56x=-8
Isolate all x's on one side. So you would add 8 on each side. and one side will cross each other out. leaving you with,
-5x-56x=-8+8
Add 8 to - 8.
-5x-56x=0
Subtract - 56x from - 5x
-61x=0
Divide each side by - 61
-61x:-61=0:-61
Therefore,
x=0
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