2 years ago

How do I solve this with Substitution?

1 answer:

8 0

They give you an "x =" statement so you plug in the right side of the equals sign into the first equation wherever x appears. So...

y = 10 - 2(y - 4)
y = 10 - 2y + 8
y = 18 - 2y
y + 2y = 18
3y = 18
y = 6

Now we plug in this result for the y-value into the "x =" statement.

x = 6 - 4
x = 2

Your answer is (2, 6)

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What is the answer to: 3 x 4 + 15- 19 x2037? help

Ierofanga [76]

Answer: -38,686

Step-by-step explanation:

3 x 4= 12

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3 years ago

A rectangle has a length of (x+5)and a with of x Write down the expression for the area of a rectangle If the area is 24cm²,find

ratelena [41]

Answer: Width = 3cm

Length = 8cm

Step-by-step explanation:

Length = x+5 cm

Width = xcm

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Area of a rectangle = length × width

x × (x + 5) = 24

x² + 5x = 24

x² + 5x - 24 = 0

x² + 8x - 3x - 24 = 0

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2 years ago

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Lina20 [59]

Seventh graders backpacks weigh less than Eleventh graders back packs

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1 year ago

Factor 3h2 – 11h - 42

Zina [86]

The answer is D
3*-42=-126
The factors of -126 that add to -11 are 7 and -18
replace -11h with 7h-18h
3h^2 + 7h - 18h - 42
Factor the first two terms and last two terms
h(3h+7) - 6(3h+7)
See how the two parentheses are the same?
THE ANSWER IS BELOW!!
(h-6)(3h+7)
the first parentheses has the terms that were outside, and the second has the original bracketed terms
This matches option D (it just multiplies the terms backwards, which gives the same result)

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Which expression has a value that is equivalent to 5n+13 when n=-15? n^2+13x

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3 years ago

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