1 year ago

Solve the system of equations 3x + y = 3 and 7x + 2y = 1.

Mathematics

1 answer:

vodka [1.7K]1 year ago

4 0

Answer:

(x, y) = (-5, 18)

Step-by-step explanation:

You have done the first two steps.

7x +2(3 -3x) = 1 . . . . . equation with y substituted

7x +6 -6x = 1 . . . . . . . eliminate parentheses using the distributive property

x = -5 . . . . . . . . . . . . . subtract 6 from both sides, collect terms

y = 3 -3(-5) . . . . . . . . use the substitution equation to find y

y = 18

The solution is (x, y) = (-5, 18).

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The seventh grade class is raising money to have a class trip at the end of the year. They began the year with $1500. They now h

Nikitich [7]

Answer:

The percent of the increase for the money the class raised is 10 %

Step-by-step explanation:

Because if you divide 1500 by 10 you get 150 that means 150 is 10 % of 1500 and if you add 150 to 1500 you get 1650 so the increase of money the class raised is 10 %

I hope this helped :)

5 0

2 years ago

Betty has a bag with 20 marbles in it. Some of the marbles are blue, some are green, and some are yellow.

Nezavi [6.7K]

392 / 500 double and take one decimal place to see percentage

52/500

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2 years ago

Read 2 more answers

If cos A = k, then the value of the expression (sin A)(cos A)(tan A) is equivalent to:

sukhopar [10]

Answer:

1-k^2

Step-by-step explanation:

tan A= sin A/cos A

(sin A)(cos A)(sin A/cos A)=(sin A)^2

(sin A) ^2 + (cos A) ^2= 1

(sin A) ^2=1-(cos A) ^2