August 2018 0 45 Report
Resuelve por sustitución el siguiente sistema de ecuaciones :
a) {2x-y=5
{3x-2y=7

b) 3a+3b=15
2a-22=-6b
GRACIAS.....
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por Yohiz

Respuestas

yohiz
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 \left \{ {{2x-y=5} \atop {3x-2y=7}} \right.

y=2x+5
3x-(2x+5)=7
3x-2x-5=7
x=7+5
x=12

y=2*12+5
y=24+5
y=29

 \left \{ {{3a+3b=15} \atop {2a-22=-6b}} \right.

a= \frac{15-3b}{3}
2( \frac{15-3b}{3} +6b=22
 \frac{30-6b}{3} +6b=22
30-6b+18b=66
-6b+18b=66-30
12b=36
b=36/12
b=3

a= \frac{15-3b}{3}
a= \frac{15-3*3}{3}= \frac{15-9}{3}  = \frac{6}{3} =2


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