Plz Help I dont understand this. solve for y and x Substitution Method.

1) 2x + 8y = 20 2) x = 5
y = 2 2x + y = 10

Acomputer store bought a program at a cost of $10 and sold it for $13. find the percent markup

Choose the linear inequality that describes the graph. the gray area represents the shaded region. a: y ≤ –4x – 2 b: y > –4x – 2 c: y ≥ –4x – 2 d: y < 4x – 2

Three students, javier, sam, and corrine, participated in a fundraiser where people donated a certain amount of money per lap that the student ran. each student also had some initial donations that were collected before the run. the equations that represent each student's total donation, y, based on the number of laps ran, x, is shown below. match each equation with the correct rate of change for that student.