Question 1165113
First let:
z -be the total number of plants in her front yard
y -be the number of plants in x weeks
x - be the number of weeks

We can form an equation
{{{y=4+2x}}} given she currently have 4 plants

AFTER X WEEKS
60% of total number of plants (y) will be in her backyard
0.6y

40% of total number of plants (y) will be in her frontyard
0.4y or z

{{{z=0.4y}}} substitute {{{y=4+2x}}}
{{{z=0.4(4+2x)}}}
{{{z=1.6+0.8x}}}

where:
z -be the total number of plants in her front yard
x - be the number of weeks

HOPE THAT HELPS!!