Valerie gives her dog 12 ounces of dog food in the morning and 12 ounces in the night. there are 75 ounces of dog food in a bag. after how many feedings will she need to buy a new bag of dog food?

The value of x in this system of equations is 1. 3x + y = 9 y = –4x + 10 substitute the value of y in the first equation: combine like terms: apply the subtraction property of equality: apply the division property of equality: 3x + (–4x + 10) = 9 –x + 10 = 9 –x = –1 x = 1 what is the value of y?