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allsm [11]
2 years ago
11

Which equation has the solution x = 9?

Mathematics
1 answer:
zepelin [54]2 years ago
6 0

Answer: the answer is 2x-3=15

Step-by-step explanation: It’s simple so whenever you see x in the equation you just plug 9 in it’s place for example:

equation 1: 2x-3=15 —> 2(9)=18-3= 15 for this equation 9 is the solution

equation 2: 4+5(9)=18 —> 4+45=49 and 49 does NOT equal to 18 therefor 9 is not a solution

equation 3: 3(9)+2= 29 and 29 does NOT equal to 25 so 9 is not the solution

equation 4: 81(9)-3=6 —> 726 does NOT equal to 6 so not a solution

equation 5: 24-2(9)=13–> 6 does not equal to 13 so 9 is not a solution

equation 6: 3(9)+7=8 —> 34 does not equal to 8 so 9 is not a solution

(hope this helps)

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A student is 7 years old. If you triple the teachers age and add the student's age the answer is 163. How old is the teacher?
pogonyaev

Answer:

52

Step-by-step explanation:

We can write this out as an equation. Let's say that the teacher's age is x. Triple the teachers age plus the students age is 163, which can be written out as:

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We want to isolate the variable, so subtract 7 from both sides. This gives us:

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Finally, we divide both sides by  3, giving:

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So the teacher is 52 years old.

Hope this helps!

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