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2 years ago

7x − 11 = 31 pls help me with this question

Mathematics

2 answers:

Katarina [22]2 years ago

7 0

Answer:

Step-by-step explanation:

add 11 to both sides, that cancels out so then your left with 7x=42, divide by 7 on both sides then you should get x=6

Sedbober [7]2 years ago

6 0

Hello, I hope you are having a wonderful day.

To solve this equation, we have to move all the constants (numbers) to the right, using the opposite operation.

7x-11=31

7x=31+11

7x=42

Divide both sides by 7 to isolate x:

x=6

Hence, x=6 (Answer)

Hope it helps!

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Good luck.

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2 years ago

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2 years ago

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andrew-mc [135]

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Step 1: Solve for x in 4x-3y=3:
4x-3y=3
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x= $\frac{3}{4}y+ \frac{3}{4}$

Step 2: Substitute $\frac{3}{4}y+ \frac{3}{4}$ for x in 5x-4y=3
5x-4y=3
5( $\frac{3}{4}y+ \frac{3}{4}$ )-4y=3
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$\frac{-1}{4}y= \frac{-3}{4}$
$\frac{ \frac{-1}{4}y}{ \frac{-1}{4} }= \frac{\frac{-3}{4} }{ \frac{-1}{4}}$ [Divide both sides by $\frac{-1}{4}$ ]
y = 3

Step 3: Substitute 3 for y in x = $\frac{3}{4}y+ \frac{3}{4}$
$\frac{3}{4}y+ \frac{3}{4}$
$\frac{3}{4}(3)+ \frac{3}{4}$
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