Question

Find value of y in equation 20-y=2y-1​

Answer 1

The value of Y = 7

Step-by-step explanation:

$20 - y = 2y - 1 \\ \\ 20 + 1 = 2y + y \\ \\ 21 = 3y \\ \\ \frac{21}{3} = y \\ \\ 7 = y \\ \\ y = 7$

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Answer 2

Question:

Find the value of $y$ in the equation $20-y=2y-1$

Thus,

$20-y=2y-1$

$-y-2y=-1-20$

$-3y=-21$

$y=-21\div(-3)$

$y = 7$

Verification,

LHS = $20-y$

= $20-7$

= $13$

RHS = $2y-1$

= $2$ × $7-1$

= $14-1$

= $13$

LHS = RHS hence, verified.

Therefore,

The value of $y$ equals to $7$.

Hope it helps