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?

Question

Everett Mullen

Mathematics

21 May, 23:56

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?

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Answers (1)

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Jerry Roy · Answer 1

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.