Hello! Can someone help me with a substitution problem? Pre-Alg level.
3x+9y=42
y=2x
1 answer:
Answer:
x=2
Step-by-step explanation:
The equation becomes 3x+9(2x)=42. Then you distribute the 9 into the 2x. Combine 3x and 18x for 21x=42. Divide 21 by both sides and you get x=2.
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