Asked by Ayomide
The change c of a telephone company is partly constant and partly varies as the number of units of call u. The cost of 90units is 1120 and the cost of 120unit is1216.find a formula that connects c and u.find c when u is 150units
Answers
Answered by
mathhelper
c = ku + b
when u=90,c=120
1120 = 90k + b
when u=120, c=1216
1216 = 120k + b
subtract: 30k =96
k = 96/30= 16/5
go back into 1120 = 90k + b to find b
then form your equation,
so if u = 150 , c = .....
when u=90,c=120
1120 = 90k + b
when u=120, c=1216
1216 = 120k + b
subtract: 30k =96
k = 96/30= 16/5
go back into 1120 = 90k + b to find b
then form your equation,
so if u = 150 , c = .....
Answered by
Delight
Solve the equation for me please in details please
Answered by
Anonymous
Nonsense this is rubbish everyone don't do this nonsense the person is showing. ugh
Answered by
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