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Andreas93 [3]
3 years ago
12

Solve this using Substitution. {y=x+1 {2x+y=7

Mathematics
1 answer:
Elina [12.6K]3 years ago
7 0
Y = x + 1....so we sub in x + 1 for y in the other equation

2x + y = 7
2x + x + 1 = 7 ....combine like terms
3x + 1 = 7....subtract 1 from both sides
3x = 7 - 1
3x = 6 ....divide both sides by 3
x = 6/3
x = 2

y = x + 1
y = 2 + 1
y = 3

so ur solution is : (2,3)
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It's fairly simple.

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120 - 100 = 20

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State the domain and the range of each relation. Then determine whether the relation is a function.
IrinaVladis [17]

Answer:

Domain:{-6,3,4}

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Step-by-step explanation:

By definition, a relation is a function if each input value has only one output value.

Given the relation:

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8 0
3 years ago
Read 2 more answers
If alvin sold 60% of his baseball cards, gave away 30% of those that were left, and still had 40 baseball cards in his possessio
kipiarov [429]

Answer:

The number of baseball card to begin with is 143

Step-by-step explanation:

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The number of sold baseball card = 60% of x

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The number of card gave away = 30 % of left cards

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Or,  40 = x - 0.6 x - 0.12 x

Or,  40 = 0.28 x

∴   x = \frac{40}{0.28}  =  142.85 ≈ 143

Hence The number of baseball card to begin with is 143  Answer

3 0
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