How many solutions does this system have?
y=-3x
-9x-4y=21

Your food costs are $5,500. your total food sales are $11,000. what percent of your food sales do the food costs represent?

In the field of thermodynamics, rankine is the unit used to measure temperature. one can convert temperature from celsius into rankine using the formula , what is the temperature in celsius corresponding to r degrees rankine? a. 9/5(c - 273) b. 9/5(c + 273) c. 5/9( c - 273) d. 5/9( c + 273)

Solving algebraic equations 2m+3=11