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3 years ago

Need answer ASAP please!!

Mathematics

1 answer:

Ugo [173]3 years ago

7 0

Answer:

1) X = -7

2) y = - 5

Step-by-step explanation:

$- 3x - 5 = 16 \\ - 3x = 16 + 5 \\ - 3x = 21 \\ \frac{ - 3x}{ - 3} = \frac{21}{ - 3} \\ x = \frac{21}{ - 3} \\ x = - 7$

$- 4(y - 2) = 12 \\ - 4y - 8 = 12 \\ - 4y = 12 + 8 \\ - 4y = 20 \\ \frac{ - 4y}{ - 4} = \frac{20}{ - 4} \\ y = \frac{20}{ - 4} \\ y = - 5$

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3 years ago

Solve the following system of equations for a and for b:

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Answer:

$a=3\\b=1$

Step-by-step explanation:

$9a+3b=30\\8a+4b=28$

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$8a+4b=28\\8a=28-4b\\a=\frac{28-4b}{8}$

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Combine like terms.

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$\frac{-9+6}{2}b=\frac{60-63}{2}$

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Muliply by the reciprocal or inverted fraction next to b.

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4 years ago

Could anyone help me out, it’s would mean a lot.

SIZIF [17.4K]

Answer:

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If two lines are perpendicular, they create 4 90° angles. Meaning, in this case, that m<DBC = 90 and m<DBA = 90.

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The sum of angles DBE and CBE = m<DBC = 90°

We can add the two angles and set it equal to 90 to find x

$2x - 1 + 5x - 42 = 90\\7x - 43 = 90\\7x = 133\\x = \frac{133}{7} =19$

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4 years ago

The product of 2 consecutive #s is 4160 what are the numbers?

KengaRu [80]

So the so the product of two consecutive numbers is 4160 or
x(x+1)=4160
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subtract 4160 from both sides
x^2+x-4160=0
find the factor (if you want to know how, just ask in the comments)
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so the answer is x could be 64 or -65
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7 0

3 years ago

Read 2 more answers