Which of the following options is a better purchase for a bicycle? option 1: a cash sale for $88 option 2: $5 down with equal payments of $8 for 10 weeks option 3: $12 down with equal payments of $5 for 12 months option 4: $20 down with equal payments of $20 for 12 months

5=812a+9+3

step 1: simplify both sides of the equation.

5=812a+9+3

5=(812a)+(9+3)(combine like terms)

5=812a+12

5=812a+12

step 2: flip the equation.

812a+12=5

step 3: subtract 12 from both sides.

812a+12−12=5−12

812a=−7

step 4: divide both sides by 812.

812a /812 = -7/812

a= -1/116

so the answer is

a=   -1/116