In the first 7 hours it is open, a bakery sells 19 cakes. The baker expects to sell c more cakes before the end of the day. Write two expressions that model the number of cakes sold that day.
Which two expressions below model the number of cakes sold that day?

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?