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faust18 [17]
4 years ago
9

How do I solve 6x+3=18. And 5(4x-5)=155

Mathematics
2 answers:
vazorg [7]4 years ago
8 0
6x+3=18
subtract 3 from both sides
6x=15
divide both sides by 6
x=2.5
5(4x-5)=155
distribute the 5
20x-25=155
add 25 to both sides
20x=180
divide both sides by 20
x=9
Tcecarenko [31]4 years ago
6 0
1) Step 1: Subtract 3 from both sides.
<span><span><span><span>
6x</span>+3</span>−3</span>=<span>18−3

</span></span><span>6x=15

</span><span>Step 2: Divide both sides by 6.

</span>6x/6 = 15/6

 when simplified its 5/2

Answer: 5/2


2) Step 1: Simplify both sides of the equation.

<span><span>5<span>(<span>4x−5</span>)</span></span>=155

</span><span><span><span>(5)<span>(4x)</span></span>+<span>(5)<span>(−5)</span></span></span>=155</span>(Distribute)

<span><span><span>20x+</span>−25</span>=155</span><span><span><span>

20x</span>−25</span>=155
</span>
Step 2: Add 25 to both sides.

<span><span><span>20x−25</span>+25</span>=155+25
</span><span><span>
20x</span>=180

</span><span>Step 3: Divide both sides by 20.

</span>20x/20= 180/20 
<span>
when simplified its x = 9

Answer: x = 9</span>
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