If a = 0 in a linear equation of the form ax + by = c, then which statement is also true?

a. the graph of this equation is a horizontal line. b. the graph of this equation is a vertical line. c. the graph of this equation is a slanted line. d. the graph of this equation can be any straight line.

Ascientist has 50 grams of a radioactive element. the amount of radioactive element remaining after t days can be determined using the equation (1) after two days the scientist receives a second shipment of 50 grams of the same element. the equation used to represent the amount of shipment 2 remaining after t days is 10) - 50 which of the following is an equivalent form of the expression for the amount remaining in shipment 2? what’s the answer?

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?

What is the slope of any line parallel to the line 8x+9y=3 in the standard (x,y) coordinate plane?