Another first grade problem

Algebra Level 1

x+y=14 x-y=6
x=10
What is y?

1 4 5 2 7 8 3 6

2 solutions

Frisk Dreemurr
Jul 31, 2020

If we know that $\color{#20A900}\boxed{x = 10}$

$\boxed{x + y = 14}$

$10 + y = 14$

$y = 14 - 10$

$\color{#20A900}\boxed{y = 4}$

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If we don't know that $x = 10$

$\boxed{x + y = 14}$

$\boxed{x - y = 6}$

$\boxed{x + y} + \boxed{x - y} = 16 + 4$

$2x = 20$

$\color{#20A900}\boxed{x = 10}$

$\boxed{x + y = 14}$

$10 + y = 14$

$y = 14 - 10$

$\color{#20A900}\boxed{y = 4}$

$\ \Large \Dagger$

NSCS 747 - 10 months, 2 weeks ago

bruh how did i do that

NSCS 747 - 10 months, 2 weeks ago

Your solution is over $\LaTeX$ -ed compared to the problem @Frisk Dreemurr LOL

A Former Brilliant Member - 10 months, 2 weeks ago

Quite great, ain't it @Percy Jackson ?

Frisk Dreemurr - 10 months, 2 weeks ago

Yup, although not deserving of a 1st grade problem.

A Former Brilliant Member - 10 months, 2 weeks ago

Lexi Sun
Jul 23, 2020

First, find an easier way. If 10+ =14 and 10- =6 what is _? Try 4 because, 10+4=14 then 10-4=6 right? Yes, so 4 is the right answer. YaY

Another first grade problem

2 solutions

If we know that x = 10 \color{#20A900}\boxed{x = 10} x = 1 0 ​

If we don't know that x = 10 x = 10 x = 1 0

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If we know that $\color{#20A900}\boxed{x = 10}$

If we don't know that $x = 10$