Hello! can someone me with a substitution problem? pre-alg level.

3x+9y=42
y=2x

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.

think about it deeply and passionately about this property

i am sorry

answer: its the third option.

step-by-step explanation:

i just took the test.