Work Step by Step
x = years, y = total height $3+x=y$ and $4 + .5x=y$ $3+x = 4+.5x$ $3+x - 3 - .5x = 4+.5x- 3 - .5x$ $.5x = 1$ $2*.5x = 2*1$ $x = 2$ $3 + x = y$ $3 + 2 = y$ $5 = y$
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