Use the substitution method to solve the following pairs of simultaneous equations x + 2y = 4, 3x - y = 1

Aiden drives to school and back each day. the school is 16 miles from his home. he averages 40 miles per hour on his way to school. if his trip takes 1 hour, at approximately what speed does aiden drive home?

Which is f(5) for the function –2x2 + 2x - 3?

Mr. thompson is on a diet. he currently weighs 260 pounds. he loses 4 pounds per month. what part of the story makes the relationship not proportional?