All categories

3 years ago

Write a system of equations with (4,-5) as its solution

Mathematics

1 answer:

leonid [27]3 years ago

8 0

Answer:

Step-by-step explanation:

I would start by choosing my coefficients for the 2 equations. I will choose 1 and 2 for the first equation and 3 and 4 for the second equation.

1x + 2y = ?

3x + 4y = ?

Now I need to figure what in on the right-hand side, so I would substitute in 4 for x and -5 for y.

1(4) + 2(-5) = 4 - 10 = -6, so my first equation would be x + 2y = -6

3(4) + 4(-5) = 12 - 20 = -8, and my second equation is 3x + 4y = -8

You might be interested in

Solve for x. -x/3= 2 A.x = -6 B.x = 6 C.x = -1

sveticcg [70]

Answer:

I thinK b dont blame me if wrong

Step-by-step explanation:

7 0

3 years ago

Read 2 more answers

Solve: |4x + 2| + 6 =0 a.all real number b.1 or -2 c.-1 or 2 d. no solution

Anna11 [10]

No solution since when you subtract six from both sides you cannot get -6 on the left side since you have use the absolute value

6 0

3 years ago

What is the slope of the line perpendicular to y=-7/4x

likoan [24]

M= - 7/4 I think this is the answer

6 0

3 years ago

Read 2 more answers

You have 480 grams of a radioactive kind of samarium. If its half-life is 90 years,

lisov135 [29]

Answer:

120 grams will be left after 180 years.

Step-by-step explanation:

A radioactive half-life refers to the amount of time it takes for half of the original isotope to decay and its given by

$N(t)=N_0(\frac{1}{2})^\frac{t}{t_{1/2}}$

where,

$N(t)$ = quantity of the substance remaining

$N_0$ = initial quantity of the substance

$t$ = time elapsed

$t_{1/2}$ = half life of the substance

From the information given we know that:

The initial quantity is 480 g,
The half-life is 90 years,
180 years is the time elapsed.

And we want to find how much will be left. For this we use the above formula.

$N(t)=480\left(\frac{1}{2}\right)^{\frac{180}{90}}\\\\N(t)=480\left(\frac{1}{2}\right)^2\\\\N(t)=480\cdot \frac{1}{2^2}=120$

120 grams will be left after 180 years.

3 0

3 years ago

HELLPPPPPPPPPPPPPPPPPPPPPPPPPPPPP

Setler79 [48]

Answer:

65 square units

Step-by-step explanation:

The area of a triangle is: height times base divided by two.

So the area of one of the triangles is 10 square units.

multiply this times 4 to get the total area of the triangles

then add the area of the square which is 5 times 5

25 plus 40 = 65 square units

PLZ MARK BRAINLIEST

3 0

3 years ago

Read 2 more answers