Evaluate the expression for x = 3 and y = 6. 5(x2 + y) + y2

Mathematics

2 answers:

Svetllana [295]2 years ago

6 0

Answer:

Step-by-step explanation:

5(x2+y)+y2

5 x (3 x 2 + 6) + 6 x 2

5 x 6 + 6 + 6 x 2

30 + 6 + 6 x 2

30 + 6 + 12

36 + 12 = 48

Katen [24]2 years ago

5 0

Answer:

Step-by-step explanation:

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Put the following equation in shape intercept form y-2=-3(x-5)

Damm [24]

Answer:

y = -3x + 17

Step-by-step explanation:

In this question, you have to put the given equation into slope intercept form.

Slope-intercept form: y = mx + b

Solve:

y - 2= -3(x - 5)

Use the distributive property to distribute the -3 to the variables inside the parenthesis.

y - 2 = -3x + 15

Add 2 to both sides to get "y" by itself.

y = -3x + 17

The slope intercept form of the line would be y = -3x + 17

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3 years ago

A boat has a speed of 15 mph in still water. It travels downstream from Greentown to Glenavon in g hours. It then goes back upst

Lerok [7]

Step-by-step explanation:

We want to find two things-- the speed of the boat in still water and the speed of the current. Each of these things will be represented by a different variable:

B = speed of the boat in still water

C = speed of the current

Since we have two variables, we will need to find a system of two equations to solve.

How do we find the two equations we need?

Rate problems are based on the relationship Distance = (Rate)(Time).

Fill in the chart with your data (chart attached)

The resulting speed of the boat (traveling upstream) is B-C miles per hour. On the other hand, if the boat is traveling downstream, the current will be pushing the boat faster, and the boat's speed will increase by C miles per hour. The resulting speed of the boat (traveling downstream) is B+C miles per hour. Put this info in the second column in the chart. Now plug it into a formula! Distance=(Rate)(Time) Now solve using the systems of equations!