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1 year ago

X+y = 8 and 2x-y=7 Anyone can help

Mathematics

2 answers:

nevsk [136]1 year ago

6 0

Answer:

Hello

Step-by-step explanation:

Méthode par combinaisons linéaires:

$\left\{ \begin{array}{ccc|c|c}x+y&=&8&1&-2\\2x-y&=&7&1&1\\\end {array} \right.\\\\\\\left\{ \begin{array}{ccc}3x&=&15\\-3y&=&-9\\\end {array} \right.\\\\\\\boxed{\left\{ \begin{array}{ccc}x&=&5\\y&=&3\\\end {array} \right. }\\$

Proof:

5+3=8 and 2*5-3=7

stiks02 [169]1 year ago

4 0

Step-by-step explanation:

x=8-y

2x-y=7

2(8-y)-y=7

16-2y-y=7

-3y=-9

y=3

x=8-y

x=8-3=5

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X+y = 8 and 2x-y=7 Anyone can help​

X+y = 8 and 2x-y=7 Anyone can help