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Sagot :
Set up a system of equations.
x + y = 7
5x + 6y = 39
x + y = 7
x = -y + 7
Substitute -y + 7 into the 2nd equation for 'x':
5(-y + 7) + 6y = 39
Distribute 5:
-5y + 35 + 6y = 39
Combine like terms:
y + 35 = 39
Subtract 35 to both sides:
y = 4
Plug this into any of the two equations to get 'x'
x + y = 7
x + 4 = 7
Subtract 4 to both sides:
x = 3
So she pulled weeds for more than 1 hour 3 times.
x + y = 7
5x + 6y = 39
x + y = 7
x = -y + 7
Substitute -y + 7 into the 2nd equation for 'x':
5(-y + 7) + 6y = 39
Distribute 5:
-5y + 35 + 6y = 39
Combine like terms:
y + 35 = 39
Subtract 35 to both sides:
y = 4
Plug this into any of the two equations to get 'x'
x + y = 7
x + 4 = 7
Subtract 4 to both sides:
x = 3
So she pulled weeds for more than 1 hour 3 times.
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