In the equations 2x +3y=9, if x increases by 3, then y

decrease by 2.

Step-by-step explanation:

2x + 3y is a constant value (which is 9).

Therefore if x increase by 3, y must decrease by 2.

$53.50

step-by-step explanation:

you have to subtract the amount of money chuck earned ($72.50) by the cost of the gas for the mower ($11.25) and the new string for the trimmer he bought ($7.75).

72.50-11.25=61.25

and then subtract $61.25 by the second thing he bought (the new string for the trimmer)

61.25-7.75=53.5

so in total it's $53.50 (53 dollars and 50 cents)

a. is correct