How to solve this question? i have to have 3 solutions

What is the solution of the systems of equations? y=2/3x+3 x=-2

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?

Write the factored form of this trinomial 9x^2+18x-7