3 years ago

50r − 6 = 82r − 70. a. r=64 b. r= -64 c.r=2 d.r=-2

Mathematics

1 answer:

lisabon 2012 [21]3 years ago

3 0

Answer:

Step-by-step explanation:

Hope this helps.

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Which of the following ordered pairs represents the solution to the system given below?

castortr0y [4]

X − 4y = 7
5x + 9y = 6

5x − 20y = 35 //1st * 5
5x + 9y = 6

5x +9y - 5x + 20y = 6 - 35 //2nd - 1st
5x + 9y = 6

29y=-29
5x=6-9y

y=-1 //1st : 29
5x=6-9*(-1)

y=-1
x=15:5 //2nd : 5

y=-1
x=3

check:
for x=3 and y=-1 there is:
x − 4y = 7 is 3 − 4*(-1) = 7 is 7=7 ok
5x + 9y = 6 is 15-9=6 is 6=6 ok

answer: (3;-1) represents the solution.

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2 years ago

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vazorg [7]

Answer:

x is 2

Step-by-step explanation:

you need to do 10-6 is 4 then 2x? is 4

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2 years ago

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