jadacherry
28.09.2019 •
Mathematics
The sum of two numbers is 105. if the larger number is increased by twice the smaller number, the result is 138. what is the larger number? if x is the smaller number and y is the larger number, which of the following system of equations represents the word problem?
x+y=105
x+2y=138
x-y=105
y+2x=138
x+y=105
y+2x=138
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Ответ:
x + y = 105
y + 2x = 138
Subtract the top equation from the bottom equation to cancel out y:
2x - x = 138 - 105
x = 33
Plug value of x into top equation:
33 + y = 105
y = 105 - 33
y = 72
So the larger number is 72.
Ответ:
since the fence will be 3 sides, the length would be length minus 2 widths
so length = 1200 - 2x
area = length x width
width is x
area = (1200-2x)*x
= 1200x -2x^2
after doing the calculations x = 600 meters, width = 300 meters