Consider the following pair of equations:

y = –2x + 8
y = x – 1

explain how you will solve the pair of equations by substitution. show all the steps and write the solution in (x, y) form.

Use the radius you found in part i (r=26.8 cm) with the surface area formula below to find the surface area of the sphere. show your work and round your answer to the nearest tenth. the surface area of a sphere: sa = 4πr^2 self note: 3.8.4

Evaluate the discriminant of each equation. tell how many solutions each equation has and whether the solutions are real or imaginary. x^2 - 4x - 5 = 0

3x + 4y = 5 x- 3y = -7 solve by substitution