In which quadrants are x and y either both negative
numbers or both positive numbers?

quadrants 1 and 3

Step-by-step explanation:

the quadrants start at the top right and go counterclockwise. above the x axis x is positive and to the right of the y axis y is positive. so x and y are both positive in the top right: quadrant 1. by the same logic, x and y are both negative in the bottom left: quandrant 3.

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

probably .5

i can on others if necessary.