Jean is x year old and her younger brother Jonathan is y years old. How old was Jean 5 years ago

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

can you post the graph?

the first domain and range set to the left is matched with the top relation, and the second set the set in the middle goes with the bottom relation.

answer is  

a.

5.56

hope you get this right.