3 years ago

(2x + y = -2 (5x + 3y = -8 Solve by substitution

Mathematics

2 answers:

Vesna [10]3 years ago

7 0

Answer: (2, -6)

Step-by-step explanation: look at the attached image

aliya0001 [1]3 years ago

3 0

(2, -6)

Step-by-step explanation:

y = -2 - 2x

5x + 3 (-2-2x) = - 8

5x - 6 - 6x = - 8

-x - 6 = 8

- 6 + 8 = x

2 = x

x = 2

y = -2 -2x

y = -2 -2(2)

y = -2 -4

y = -6

(x, y) = (2, -6)

You might be interested in

The points (-16,r) and (-4,11)lie on a line with slope 1/2. Find the missing coordinate r?

Sergio [31]

Answer: The missing coordinate R is 5.

Step-by-step explanation:

11=1/2(-4) + B

11=-2 +B

B= 13

B represents the y-intercept

so we will use the equation y=mx + B and we know the slope and y intercept.

r= 1/2(-16) + 13

r= 5

3 0

4 years ago

A female flea can consume about 1.4×10^-5 liter of blood per day .If a dog has 100 female fleas ,how much blood do the fleas con

Alex17521 [72]

7162525):! I’m going home what I

7 0

3 years ago

Select the appropriate values of x that are solutions to f (x)=0, where f (x) = -7x^2 +4x+9

Ghella [55]

$-7x^2 +4x+9=0\\
\Delta=4^2-4\cdot(-7)\cdot9=16+252=268\\
\sqrt{\Delta}=\sqrt{268}=2\sqrt{67}\\
x_1=\frac{-4-2\sqrt{67}}{2\cdot(-7)}=\frac{-4-2\sqrt{67}}{-14}=\frac{2+\sqrt{67}}{7}\approx1.46\\
x_2=\frac{-4+2\sqrt{67}}{2\cdot(-7)}=\frac{-4+2\sqrt{67}}{-14}=\frac{2-\sqrt{67}}{7}\approx-0.88\\$