Can anybody help me please? I'll give brainlest for correct answer​

Iwill make brain if you me correctly fill this out needs due today pls and send it back to me (click the link and you will get it)

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

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10