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gtnhenbr [62]
4 years ago
12

18x-16y=-312 78x-16y=408

Mathematics
1 answer:
lilavasa [31]4 years ago
5 0
Elimination
multiply first equation by -1 and add to 2nd


-18x+16y=312
<u>78x-16y=408 +</u>
60x+0y=720

60x=720
divide both sides by 60
x=12

sub back

18x-16y=-312
18(12)-16y=-312
216-16y=-312
-16y=-528
divide both sides by -16
y=33


x=12
y=33
(x,y)
(12,33)
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\large\boxed{5}

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Pineapples cost $2.50 each and mangos cost $1.50 each. Tim purchased 15 pieces of fruit for $29.50. How many pineapples and how
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We can create equations to solve this.

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¿De que manera usted se informa a la hora de elegir un candidato presidencial? ENTRAR AL LINK es una encuesta de 1 pregunta ,GRACIAS

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Can someone answer 2,3,4
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