Question

Solve using substitution.
y = 9
5x – 3y = -12

Answer 1

Let's solve for x.

y=95x−3y

Step 1: Flip the equation.

95x−3y=y

Step 2: Add 3y to both sides.

95x−3y+3y=y+3y

95x=4y

Step 3: Divide both sides by 95.

95x

95

=

4y

95

x=

4

95

y

Explanation:

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Answer 2

5x-3(9)=-12

5x-27=-12

+27. +27

5x = 15

÷5. ÷5

x= 3