Iḿ in early college this stuff is hard. The question is ab+3c=2d, for b

Which of the following best describes the figure?

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?

y=2x−1 5x−4y=1 is (1,1)(1,1) a solution of the system?