x could represent the money being made by a successful business and y could represent the popularity of a business
this is because there is a linear relationship- as x increases, y increases
So
if x is the number she spent on each sister and y is the number she spent on each nephew then
180=3x+2y
she wants to spend 15 dollars more on sisters than nephews
so
x=15+y
solve
we have
180=3x+2y and
x=15+y
subsitute 15+y for x
180=3(15+y)+2y
180=45+3y+2y
180=45+5y
minus 45 both sides
135=5y
divide both sides by 5
27=y
solve for x
x=15+y
x=15+27
x=42
she spent $42 on each sister
We can solve for x or solve for y,
for x
y+6=5x
divide both sides by 5

=x
for y
y+6=5x
minus 6 from both sides
y=5x-6
Y=7............................................................................................................................................................
Do you still need help on this?