SOLUTION: I am working on Algebra, Systems of Equations and Inequalities. I am very confused. The question is SUBSTITUTION Use substitution to solve each system of equations. {{{ x=3y

Question 853441: I am working on Algebra, Systems of Equations and Inequalities. I am very confused. The question is
SUBSTITUTION
Use substitution to solve each system of equations.

x=
y=

x=
y=

x=
y=
Found 2 solutions by Alan3354, JulietG:
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
Use substitution to solve each system of equations.

x is solved for in the 1st eqn, so sub for x in the 2nd.

-----
x = 3y
x = 5
=================================
--> x = 2y + 4

Same as the 1st one.
========================

Same as #1.
email via the TY note for help or to check your work.

Answer by JulietG(1812) (Show Source): You can put this solution on YOUR website!
Let's look at the first one.
x = 3y
2x + 3y = 15
.
To solve this using substitution, take the known value of X from the first equation and put it into the second equation.
.
2x + 3y = 15
2(3y) + 3y = 15 (substituted the 3y in place of the X)
Multiply
6y + 3y = 15
Add
9y = 15
Divide each side by 9
Y =
If y = 1, then x = 3 * 1, or 5 [x=3y from the first equation]
.
Use the same method to solve the others. If you need further help, please post questions one at a time.
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