Simplify I already passed this I just guessed but I want this for future people that need help:D

1-for what value of x is line a parallel to line b 2-for what value of x is line a parallel to line b

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

Evaluate the expression for the given value of the variable 2×(c2-5) for c=4