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uranmaximum [27]
3 years ago
5

Evaluate each expression for x=3, y= -4 and z= 6.

Mathematics
1 answer:
Elena L [17]3 years ago
8 0

Answer:

yes so basically where the negative is outside the parenthesis is a understood 1 or in your case a negative 1,is this what you needed help with?

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10. 2x + 7y = 1<br> 2x - 4y = 12<br> Solve for y
adoni [48]

Answer:

The solution for y = -1.

Step-by-step explanation:

Given:

2x\ +\ 7y\ =\ 1    ....(1)

2x\ -\ 4y\ =\ 12  ....(2)

So, to solve for y, first we solve for x in equation (2):

2x-4y=12

⇒2x=12+4y

Dividing both sides by 2,

⇒x=6+2y            

Now, substituting the value of x  in equation (1):

2x+7y=1

⇒2(6+2y)+7y=1

⇒12+4y+7y=1

⇒12+11y=1

⇒11y=1-12

⇒11y=-11

Dividing both sides by 11,

⇒y=-1

Therefore, the solution for y = -1.

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85x+60=485
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