3 years ago

Please help with sloving inequality

Mathematics

1 answer:

emmainna [20.7K]3 years ago

8 0

28. multiply 12 by 5 =-60
29. divide 39 by 3 = 13
30.divide 15 by 4 = 3.75
31. multiply 2 by 10 = -20

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The sum of two numbers is 39. The second number is 3 more than three times the first number. Let x represent the first number an

GenaCL600 [577]

Answer:

$The\: value \:of\: the\: first\: number\:is\:9$

Step-by-step explanation:

$We\:have\:a\:system\:of\:equation:\\\left \{ {{x+y=39} \atop {3x+3=y}} \right. \\\Leftrightarrow \left \{ {{39-x=y} \atop {3x+3=39-x}} \right. \\\Leftrightarrow \left \{ {{39-x=y} \atop {4x=36}} \right. \\\Leftrightarrow \left \{ {{y=39-9} \atop {x=9}} \right. \\\Leftrightarrow \left \{ {{y=30} \atop {x=9}} \right. \\\Rightarrow x=9$