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Write the equation for the height of balloon A.
= 60 + 15
Write the equation for the height of balloon B.
= 40 + 20
Eliminate a variable.
Subtract the two equations.
Isolate the variable term.
Subtract 20 from each side.
–20 = –5
Divide each side by –5
Substitute 4 for
in the equation for balloon A.
= 60 + 15(4)
= 60 + 60 or 120
The balloons are at the same height when they are 120 m from the ground.
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