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2 years ago

Given that 7 x − 2 y = 35 Find y when x = − 9

Mathematics

2 answers:

gizmo_the_mogwai [7]2 years ago

7 0

Answer:

$\boxed{y = -49}$

Step-by-step explanation:

=> $7x-2y = 35$

Given that x = -9

=> $7(-9) -2y = 35$

=> $-63-2y = 35$

Adding 63 to both sides

=> $-2y = 35+63$

=> $-2y = 98$

Dividing both sides by -2

=> $y = -49$

Sergio [31]2 years ago

3 0

so x = minus 9

then

7 × (-9) - 2y = 35

-63 - 2y = 35

-2y = 35 plus 63

-2y = 98

- y = 49

y = -49

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FIRST EXPRESSION:

- If $b=-3$ , the value of $4b(b+1)$ is $24$

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SECOND EXPRESSION:

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Yes, for any value of "b" the value of the first expression is greater than the value of the second expression.

Step-by-step explanation:

Substitute the given values of "b" into each expression and evaluate.

- For the first expression $4b(b+1)$ , you get:

If $b=-3$ → $4(-3)(-3+1)=24$

If $b=-2$ → $4(-2)(-2+1)=8$

If $b=10$ → $4(10)(10+1)=440$

- For the second expression $(2b+7)(2b-8))$ , you get:

If $b=-3$ → $(2(-3)+7)(2(-3)-8)=-14$

If $b=-2$ → $(2(-2)+7)(2(-2)-8)=-36$

If $b=10$ → $(2(10)+7)(2(10)-8)=324$

You can observe that for any value of "b" the value of the first expression is greater than the value of the second expression.

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