SOLUTION: Simultaneous Equations Exercise 1: substitution method 1 Use the substitution method to solve the following: Q1: -6x=y 2x+y=-2 Q2: x-y=1 Y=3x+3. someone hel

Algebra ->  Test -> SOLUTION: Simultaneous Equations Exercise 1: substitution method 1 Use the substitution method to solve the following: Q1: -6x=y 2x+y=-2 Q2: x-y=1 Y=3x+3. someone hel      Log On


   

Question 761069: Simultaneous Equations
Exercise 1: substitution method 1
Use the substitution method to solve the following:
Q1: -6x=y
2x+y=-2
Q2: x-y=1
Y=3x+3. someone help me, please.!
Answer by Cromlix(4381) About Me  (Show Source):
You can put this solution on YOUR website!
-6x = y
2x + y = -2
-6x - y = 0
2x + y = -2
Add together
-4x = -2
x = -2/-4
x = 1/2
Substitute x = 1/2 in
2x + y = -2
2(1/2) + y = -2
1 + y = -2
y = -2 -1
y = -3
x= 1/2 y = -3
x - y = 1
y = 3x + 3
x - y = 1
-3x + y = 3
Add
-2x = 4
x = 4/-2
x = -2
Substitute x = -2 in
x - y = 1
-2 - y = 1
-y = 1 + 2
-y = 3
y = -3
x = -2 y = -3
Hope this helps.
:-)