When converting a linear equation into an an augmented matrix which equation form is needed- slope intercept- negative form- graph form- or standard form

Janie has $3. she earns $1.20 for each chore she does and can do fractions of chores. she wants to earn enough money to buy a cd for $13.50. write an inequality to determine the number of chores, c, janie could do to have enough money to buy the cd.

Ineed me i stuck and i don’t want to get it wrong

What happens to the area as the sliders are adjusted? what do you think the formula for the area of a triangle is divided by 2?