# SOLUTION: I need help in solving the system of equations by elimination. 1. 2x-y=3; x+2y=-1 2. x+2y=-4; 2x-3y=1 3. Solve the system of equations by substitution. 3x+y=3; y=-x-3 How do

Algebra ->  Algebra  -> Linear-equations -> SOLUTION: I need help in solving the system of equations by elimination. 1. 2x-y=3; x+2y=-1 2. x+2y=-4; 2x-3y=1 3. Solve the system of equations by substitution. 3x+y=3; y=-x-3 How do       Log On

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 Question 363830: I need help in solving the system of equations by elimination. 1. 2x-y=3; x+2y=-1 2. x+2y=-4; 2x-3y=1 3. Solve the system of equations by substitution. 3x+y=3; y=-x-3 How do you solve the system of equations by graphing? 4. x+2y=-1; 2x+2y=-4 5. y=2x; y=x+2 Thank you for help. Answer by ewatrrr(10682)   (Show Source): You can put this solution on YOUR website!``` Hi, solving a system of equations by elimination Example: Note: the process is to eliminate one of the variables 2x- y = 3 x+2y = -1 Multiply both sides of the equation by 2 to eliminate the y varaible 4x- 2y = 6 x+ 2y = -1 Add: 5x = 5 Solve for x and substitute into one of the original equations to find y x = 1 (2-y = 3) y = -1 check your answers using one of the equations Solve a system of equations by substitution Ex: 3x+y=3; y=-x-3 substituting y=-x-3 for y 3x + (-x-3)=3 2x = 6 x = 3 substitute value for x into y = -x -3, y = -6 check your answers using one of the equations solve system of equations by graphing read from graph where the two lines intersect: Pt(2,4) check your answer by substituting the ordered pair into one of the equations ex: y=2x; y=x+2 ```