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2 years ago

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A 2 pound box of salt sells for $.89 and a 5 pound box sells for 2.09. What is the linear equation for this?

1 answer:

castortr0y [4]2 years ago

4 0

Y = ax + b;

0.89 = a * 2 + b and 2.09 = a * 5 + b =>
=> 2.09 - 0.89 = a * 5 + a * 2 + b - b => 1.20 = 3 * a => a = 1.20 / 3 => a = 0.40;
b = 0.89 - 0.40 * 2 => b = 0.89 - 0.80 => b = 0.09;

y = 0.40x + 0.09 => 0.40x - y + 0.09 = 0 is the linear equation.

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$\huge{\boxed{\sf{ ( 3 , 3 ) }}}$

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Hope I helped!

Best regards!

~ $\text{ TheAnimeGirl}$

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