Asystem of equations is given below:
y = 4x – 3
2x + 7y = 41
which of the following steps could be used to solve by substitution? (4 points)
2(y = 4x – 3) + 7y = 41
4x – 3 = 2x + 7y
2x + 7(4x – 3) = 41
2(y = 4x – 3)

If x=-3 is the only x-intercept of the graph of a quadratic equation, which statement best discribes the discriminant of the equation?

Determine the solution for mc001-1.jpeg

The weight of a radioactive isotope was 96 grams at the start of an experiment. after one hour, the weight of the isotope was half of its initial weight. after two hours, the weight of the isotope was half of its weight the previous hour. if this pattern continues, which of the following graphs represents the weight of the radioactive isotope over time? a. graph w b. graph x c. graph y d. graph z