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3 years ago

Solve with either Substitution or Eleminiton 2x – 9y = 32 4x + y = -12

Mathematics

2 answers:

ruslelena [56]3 years ago

5 0

-2 for the first one and -4 for the second one

Shtirlitz [24]3 years ago

3 0

4x-18y=64
4x+y=-12
-19y=76
y=-4

4x+(-4)=-12
4x=-8
x=-2

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An electrician charges a flat fee for each job plus an hourly rate . He charged one customer $90 for a job that took him 3 hours

lianna [129]

Answer:

let x equal the service charge.

let y equal the per hour charge.

for the job that cost 450, the equation is 450 = x + 6y

for the job that cost 330, the equation is 330 = x + 4y

these two equations needs to be solved simultaneously.

subtract the second equation from the firs to get 120 = 2y

solve for y to get y = 60.

in the first equation, replace y with 60 to get 450 = x + 6*60.

simplify to get 450 = x + 360.

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it appears that the service charge is equal to 90 and the per hour charge is equal to 60.

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the numbers check out.

the service charge is 90.

the per hour charge is 60.

i believe your solution is that the electrician charges a flat fee of 90 plus an hourly fee of 60 for a service call.

Step-by-step explanation:

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2 years ago

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zhuklara [117]

Answer:

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The measure of the angle θ between u and v = 0.785radians

Step-by-step explanation:

The detailed steps is as shown in the attachment.

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