Question

3y+2x = 21
x pe 3 - 2y=11

Answer 1

3y+2x=21⇒3y=21-2x⇒$y= \frac{21-2x}{3}$
$\frac{x}{3}-2( \frac{21-2x}{3})=11$
$\frac{x-2(21-2x)}{3}=11$
$\frac{x-42+4x}{3} =11$
$\frac{5x-42}{3}=11$
[tex]5x-42=33 [/tex]
$5x=75$
$x= \frac{75}{5}$
$x=15$
$y= \frac{21-2x}{3} = \frac{21-30}{3}= \frac{-9}{3}=-3$
Raspuns final:x=15;y=-3

Answer 2

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