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masha68 [24]
3 years ago
8

Solve using substitution. -5x + y = 16 7x – 6y = 19

Mathematics
1 answer:
exis [7]3 years ago
8 0
-5x+y=16
y=5x+16
7x-6(5x+16)=19
7x-30x-96=19
-23x-96=19
-23x=(19+96)
-23x=115
x=(115/-23)
x=-5
-5(-5)+y=16
25+y=16
y=(16-25)
y= -9

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The expression that has a value of 62.45 is the second answer choice 0.6245 × 10²

To determine the expression that has a value of 62.45 among the given answer choices, we will evaluate each of the answer choices.

  • For the first answer choice - 0.006245 × 105 = 0.006245 × 10⁵

0.006245 × 10⁵ = 624.5

  • For the second answer choice - 0.6245 × 102 = 0.6245 × 10²

0.6245 × 10² = 62.45

  • For the third answer choice - 6.245 ÷ 101 = 6.245 ÷ 10¹

6.245 ÷ 10¹ = 0.6245

  • For the fourth answer choice - 624.5 × 103 = 624.5 × 10³

624.5 × 10³ = 624500

From above, the second answer choice is the expression that has a value of 62.45

Hence, the expression that has a value of 62.45 is 0.6245 × 10²

Learn more here: brainly.com/question/17633165

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