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2x+y=21;y=-2x+21 please hurry I need this straight away​
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24 votes
2x+y=21;y=-2x+21
please hurry I need this straight away​

User Smartse
by
3.4k points

1 Answer

3 votes

Explanation:

2x + y = 21

Solving

2x + y = 21

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-1y' to each side of the equation.

2x + y + -1y = 21 + -1y

Combine like terms: y + -1y = 0

2x + 0 = 21 + -1y

2x = 21 + -1y

Divide each side by '2'.

x = 10.5 + -0.5y

Simplifying

x = 10.5 + -0.5y

User Futurecat
by
3.2k points
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