Mathematics: Solve by using substitution-7x-2y=-13 and x-2y=11

Solve by using substitution-7x-2y=-13 and x-2y=11 - id72132111786207, coreycbg1127

Ответ:

franklinkaylieg1145

30.12.2021

$\left \{ {{-7x-2y=-13} \atop {x-2y=11}} \right. \\\\ \left \{ {{-7x-2y=-13} \atop {x=11+2y}} \right.\\\\
Substitute\ second\ equation\ into\ the\ first\ one:\\\\
-7(11+2y)-2y=-13\\
-77-14y-2y=-13\\
-77-16y=-13\ \ \ |Add\ 77\\
-16y= 64\ \ \ |Divide\ by\ -16\\
y=-4\\\\x=11+2y=11+2*(-4)=11-8=3\\\\ \left \{ {{y=-4} \atop {x=3}} \right.$

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Ответ:

fvmousdiana

27.06.2022

Mathematics

110698.56 square miles

step-by-step explanation:

multiply 3.8 by 102

387.6

multiply 2.8 by 102

285.6

multiply those two to get

110698.56 square miles

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Solve by using substitution
-7x-2y=-13 and x-2y=11

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