Question

the value of 'x'if y=1÷2and 3x+4y=20

Answer 1

$y = \frac{x}{2} \\ 3x + 4y = 20 \\ 3x + 4( \frac{x}{2} ) = 20 \\ x + 2x = 20 \\ 5x = 20 \\ x = 4$

Answer 2

$3x + 4(1 \div 2) = 20 \\ 3x + 2 = 20 \\ 3x = 18\\ x = 6$
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