Algebra 1 homework 3x-x-5=2(x + 2) -9

Solve this equation using substitution. {4x + y = −2} {4x + 6y = 44}

1) prove that 731^3−631^3 is divisible by 100 2) prove that 99^3−74^3 is divisible by 25

Acontainer holds 0.7 liters of oil and vinegar. 3/4 of the mixture is vinegar. how many liters of oil are in the container? express your answer as both a fraction and a decimal.