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justyne2004
03.02.2020 •
Mathematics
Express the area of a rectangle with length 4x^34x
3
4, x, start superscript, 3, end superscript and width 555 as a monomial.
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Ответ:
x = the number of minutes of calls
y = the total cost
Plan A:
y = 0.07x + 15 (costs $0.07 per minute of calls(x) plus a fee of $15)
Plan B:
y = 0.09x (costs $0.09 per minute of calls(x) and has no initial fee)
Since you want to find when they cost the same for the same amount of minutes, you can set the equations equal to each other because they have the same cost
y = y
0.07x + 15 = 0.09x To find x, isolate/get the variable "x" by itself in the equation. Subtract 0.07x on both sides to get "x" on one side
0.07x - 0.07x + 15 = 0.09x - 0.07x
15 = 0.02x Divide 0.02 on both sides to get "x" by itself
750 = x
Now that you know x = 750, you can substitute/plug it into either equation to find y.
y = 0.09x Plug in 750 into "x" since x = 750
y = 0.09(750)
y = 67.5
y = 0.07x + 15 (proves they will cost the same)
y = 0.07(750) + 15
y = 52.5 + 15
y = 67.5
x = 750 minutes
y = $67.50
So both plans will have the same amount of minutes of 750 at the same cost of $67.50