The first equation of each system is multiplied by 4. By what number would you multiply the second e

Algebra
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The first equation of each system is multiplied by 4. By what number would you multiply the second equation in order to eliminate the x variable by adding? First equation: 3x - 2y = 4 ; second equation: 3x - 2y = 4 ; second: 4x + 5y = 28

Apr 29th, 2015

The second equation is multiplied by -3 to eliminate x variable when equations are added . 

The first equation is multiplied by 4. So we will get 12x-8y=16. The equation 4x+5y=28 should be multiplied by -3. The second equation will become -12x-15y=-84. This way we can eliminate the "x" variable when equations are added. When we add 12x-8y-12x-15y=16-84

-23y=-68

23y=68

y=68/23


Apr 29th, 2015

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Apr 29th, 2015

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