Which of the following properties guarantees the truth of the statement? If x = y and 15 = x + 2y, then 15 = y + 2y.
a Symmetric property of equality
b Addition Property of equality
С
Reflexive property of equality
d Substitution property of equality

What is the name used to describe a graph where for some value of x, there exists 2 or more different values of y?

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15

Acoffee shop orders at most $3,500 worth of coffee and tea. the shop needs to make a profit of at least $1,900 on the order. the possible combinations of coffee and tea for this order are given by this system of inequalities, where c = pounds of coffee and t = pounds of tea: 6c + 13t ≤ 3,500 3.50c + 4t ≥ 1,900 which graph's shaded region represents the possible combinations of coffee and tea for this order?