Algebra Two | optimization equations, constraints, minimum and maximum values (pls help lol)

Solve - pv + 40 < 65 for v solve 7w - 3r = 15 for r

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

What is the perimeter of trapezoid jklm? + units 2 + + units 9 + units 9 + + units