Use the substitution property of equations to solve the following equation for $x$ if $y = 3 x$ .
$4 x + 3 y = 39$

Answer

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Answer

Final Answer: The solution to the equation is $x = 3$ .

Steps

Step 1 ：We are given that $y = 3 x$ . We can substitute this into the equation $4 x + 3 y = 39$ to solve for $x$ .

Step 2 ：Substituting $y = 3 x$ into the equation gives us $4 x + 3 (3 x) = 39$ .

Step 3 ：Simplifying the equation gives us $13 x = 39$ .

Step 4 ：Dividing both sides of the equation by 13 gives us $x = 3$ .

Step 5 ：Final Answer: The solution to the equation is $x = 3$ .