All categories

2 years ago

Eighth grade AA.8 Solve a system of equations using substitution clouds Solve using substitution. 4x + 7y = 9 y = 3 ( , ) Submit

Mathematics

1 answer:

lana [24]2 years ago

7 0

Answer: (-3, 3)

Step-by-step explanation:

4x + 7y = 9

y = 3

Replace "y" with "3" in the first equation to solve for x:

4x + 7(3) = 9

4x + 21 = 9

4x = -12 subtracted 21 from both sides

x = -3 divided both sides by 4

You might be interested in

Brittany walked 8,910 feet in 45 minutes. She walked at a constant rate. At what rate did Brittany walk in feet per minute?

jeyben [28]

Answer:

198 feet per minute

Step-by-step explanation:

8910 feet ÷ 45 minutes = 198 feet per minute

4 0

2 years ago

Read 2 more answers

What is an example of a one step equation that would use multiplication

poizon [28]

Answer:

Multiplication equation 6 t = 54 6t = 54 6t=54 Multiply each side by five.

7 0

2 years ago

Solve the equation: x2 = 1

oee [108]

Answer:

x = 0.5

Step-by-step explanation:

hope this helps!

3 0

2 years ago

Read 2 more answers

Show work and explain with formulas.

Juli2301 [7.4K]

20 Answer: a₁ = 4

Step-by-step explanation:

$a_n=324,\ r=3,\ n=5\\\\a_n=a_1 \cdot r^{n-1}\\\\324=a_1\cdot 3^{5-1}\\\\\dfrac{324}{3^4}=a_1\\\\\dfrac{324}{81}=a_1\\\\\large\boxed{4}=a_1$

21 Answer: n = 13

Step-by-step explanation:

$a_n=\dfrac{1}{64},\ a_1=64,\ r=\dfrac{1}{2}\\\\a_n=a_1 \cdot r^{n-1}\\\\\dfrac{1}{64}=64\cdot \bigg(\dfrac{1}{2}\bigg)^{n-1}\\\\\dfrac{1}{64\cdot 64}=\bigg(\dfrac{1}{2}\bigg)^{n-1}\\\\\dfrac{1}{2^6\cdot 2^6}=\dfrac{1}{2^{n-1}}\\\\6+6=n-1\\\\\large\boxed{13}=n$

22 Answer: n = 5

Step-by-step explanation:

$a_n=48,\ a_1=1875\ r=\dfrac{2}{5}\\\\a_n=a_1 \cdot r^{n-1}\\\\48=1875\cdot \bigg(\dfrac{2}{5}\bigg)^{n-1}\\\\\dfrac{48}{1875}=\bigg(\dfrac{2}{5}\bigg)^{n-1}\\\\\dfrac{16}{625}=\bigg(\dfrac{2}{5}\bigg)^{n-1}}\\\\\bigg(\dfrac{2}{5}\bigg)^4=\bigg(\dfrac{2}{5}\bigg)^{n-1}}\\\\4=n-1\\\\\large\boxed{5}=n$

6 0

2 years ago

Read 2 more answers

What is the answer please help!

Sav [38]

Answer:

(1,3)

Step-by-step explanation:

8 0

2 years ago

Read 2 more answers