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GrogVix [38]
3 years ago
8

3x+5y=4, 2x-y=-7 solve using substitution

Mathematics
1 answer:
victus00 [196]3 years ago
6 0
 <span>3x+5y=4...(1)
 2x-y=-7...(2)
by(2) : y = 2x+7
subsct in (1) : 
3x +5(2x+7) = 4 
13x = - 31
x = -31/13
y = 2(-31/13)+7 = 29/13</span>
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O.9c + 1.89r = 17.01 c=18.9 - 2.1r equation answer
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<u><em>The complete question is</em></u>

A chef bought $17.01 worth of ribs and chicken. Ribs cost 1.89 per pound and chicken costs 0.90 per  pound. The equation 0.90 +1.89r = 17.01 represents the relationship between the quantities in this  situation.

Show that each of the following equations is equivalent to 0.9c + 1.89r = 17.01.

Then, explain when it might be helpful to write the equation in these forms.

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Solve the equation for r

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Divide by 1.89 both sides

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Simplify

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