3 years ago

Solve 3x-y=-12 x+y=18

Mathematics

2 answers:

anyanavicka [17]3 years ago

5 0

Y = 18 - x
3x - 18 + x = -12
4x = 30
X = 30/4
= 7 1/2

Sergio [31]3 years ago

3 0

Answer:

(1.5, 16.5 )

Step-by-step explanation:

Given the 2 equations

3x - y = - 12 → (1)

x + y = 18 → (2)

Adding the 2 equations term by term will eliminate the y- term

4x + 0 = 6

4x = 6 ( divide both sides by 4 )

x = 1.5

Substitute x = 1.5 into (2) and evaluate for y

1.5 + y = 18 ( subtract 1.5 from both sides )

y = 16.5

solution is (1.5, 16.5 )

You might be interested in

Which choice represents the expanded form of the expression, (x−2)^3?

schepotkina [342]

(x-2) ^3

x^3-6x^3+12x-8

5 0

3 years ago

Hailey is a salesperson who sells computers at an electronics store. She makes a base pay amount of $100 per day regardless of s

finlep [7]

Answer:

P(x)=0.025x+100

Step-by-step explanation:

The 0.025 is 2.5% as a decimal. Then, the +100 is for the base pay amount Hailey receives.

3 0

4 years ago

Read 2 more answers

How do I find the area of the circular racetrack?

BabaBlast [244]

Answer:

8483 ft²

Step-by-step explanation:

Subtract the area of the smaller circle from the area of the greater circle

Greater Circle area:

πr² = π × 140²

= 61583.2 ft²

Smaller Circle area:

= π × 130²

= 53099.8 ft²

Area of track:

61583.2 - 53099.8 = 8483.4ft²

= 8483ft² (to the nearest ft²)

6 0

3 years ago

Find the percent of increase for 4 to 7. round to the nearest tenth if necessary. also someone please explain how to do this.

dem82 [27]

Answer:

75%

Step-by-step explanation:

The percent increase is calculated as

percent increase = $\frac{increase}{original number}$ × 100%

increase = 7 - 4 = 3, thus

% increase = $\frac{3}{4}$ × 100% = $\frac{3(100)}{4}$ = 75%

8 0

3 years ago

If r = 8 units and x = 6 units, then what is the volume of the cylinder shown above?

34kurt

Answer:

1206.37

Step-by-step explanation:

v= $\pi$ r2h

5 0

3 years ago