Given the following m(x)=5x-3
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-x^2-x+19=y
X=y+80
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x=y+80
3√11=y+80
minus 80 both sides
-80+3√11=y
x=3√11
y=-80+3√11
solution
(x,y)
(3√11,-80+3√11)
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Answer: she mailed 3 letters to Europe
Step-by-step explanation:
Let x represent the number of letters that Nancy mailed to Europe.
Let y represent the number of letters that Nancy mailed to United States.
Nancy mailed 5 letters, some to Europe and some to the United States. This means that
x + y = 5
A letter mailed within the United States costs $0.44. A letter to Europe from United date cost $ 0.94 to mail. If the letters that Nancy mailed cost $3.70, then
0.94x + 0.44y = 3.7 - - - - - - - - - - - -1
Substituting x = 5 - y into equation 1, it becomes
0.94(5 - y) + 0.44y = 3.7
4.7 - 0.94y + 0.44y = 3.7
- 0.94y + 0.44y = 3.7 - 4.7
- 0.5y = - 1
y = - 1/ - 0.5 = 2
x = 5 - y = 5 - 2
x = 3
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Answer:
Step-by-step explanation
1+1 = 11
A.) b = –16
B.) b = –8
C.) b = 8
D.) b = 16
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