Question

find the value of y in equation 2x+y=7,if x=2. Find x if y=1
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Answer 1

Answer:

$2x + y = 7 \\ ifx = 2 \\ 2 \times 2 + y = 7 \\ y = 7 - 4 \\ y = 3 \\ if \: y = 1 \\ 2x + 1 = 7 \\ 2x = 7 - 1 \\ 2x = 6 \\ x = 3$