Evaluate each expression if a = 12, b = 9, and c = 4.

In the coordinate plan (-6,9) b (3,9) c (3,3) def is shown in the coordinate plan below

Tomas is making trail mix using granola and walnuts. he can spend a total of $12 on the ingredients. he buys 3 pounds of granola that costs $2.00 per pound. the walnuts cost $6 per pound. he uses the equation to represent the total cost, where x represents the number of pounds of granola and y represents the number of pounds of walnuts. he solves the equation for y, the number of pounds of walnuts he can buy. answer- b tomas added 6 to both sides of the equation instead of subtracting 6. just took the test

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much