(Sorry about the bad quality) but can someone please explain how to do this! My teacher is useless and doesn’t help. :(

The table respent two linear functions the equation respented by the first tables is given

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

Find the quotient. 50a2 – 98b2 -5a +7b