Question

which of these shows the result of using the first equation to substitute for y in the second equation then combing like terms
y=3x
2x+3y=55

Answer 1

$2x + 3y = 55$

$2x + 3(3x) = 55$

$2x + 9x = 55$

$11x = 55$

$\frac{11x}{11} = \frac{55}{11}$

x=5