3 years ago

Solve 2a5b=-19 3a+5b=9

Mathematics

1 answer:

mel-nik [20]3 years ago

7 0

Answer:

a=28, b=-15

Step-by-step explanation:

$Method\ by\ linear\ combinaisons\\\left\{\begin{array}{ccc|c|c|}2a+5b&=&-19&-1&3\\3a+5b&=&9&1&-2\\\end{array}\right.\\\\\\\left\{\begin{array}{ccc}a&=&28\\5b&=&-75\\\end{array}\right.\\\\\\\left\{\begin{array}{ccc}a&=&28\\b&=&-15\\\end{array}\right.\\$

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