## Lower Secondary Mathematics

PSLE marks the graduation of Primary school students and their entry into Secondary schools as teenagers. Discuss all issues about Secondary schooling here.
Sruthi
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### Re: Lower Secondary Mathematics

can anyone please help me with this question.thank you in advance

Sruthi
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Posts: 243
Joined: Thu Nov 12,

### Re: Lower Secondary Mathematics

-can you please help with question also. Advanced thank you friends

Jmaths.SG
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### Re: Lower Secondary Mathematics

Sruthi wrote: can anyone please help me with this question.thank you in advance

questionable_i
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### Re: Lower Secondary Mathematics

Can anyone help me with this question.

1. The sine of an angle is 0.7420. Give two possible values for the angle in degrees.

Answer: ______________ or ______________

Jmaths.SG
YellowBelt
Posts: 19
Joined: Fri Apr 01,

### Re: Lower Secondary Mathematics

questionable_i wrote:Can anyone help me with this question.

1. The sine of an angle is 0.7420. Give two possible values for the angle in degrees.

Answer: ______________ or ______________

sin (angle) = positive, when 0 < angle < 180
sin (angle) = negative, when 180 < angle < 360

Since sin (angle) = 0.7420 -> positive
Both angles must be between 0 to 180.
sin^(-1) 0.7420 = 47.9 deg (first ans)
180 deg - 47.9 deg = 132.1 deg (second ans)

tankee
Site Admin
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Location: Singapore
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### Re: Lower Secondary Mathematics

Kindly help with the following qn, thanks.

Without drawing the graphs, explain why the simultaneous equations
y = -2x + 5
y = 2x - 33
have no solution

Future Academy
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Posts: 81
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### Re: Lower Secondary Mathematics

tankee wrote:Kindly help with the following qn, thanks.
Without drawing the graphs, explain why the simultaneous equations
y = -2x + 5
y = 2x - 33
have no solution
Hi, is there any typo error in the question?

I am able to find the solution, which is x= 9.5 and y=-14.

If the question was to solve

y = 2x + 5
y = 2x - 33
or
y = -2x + 5
y = -2x - 33

then there is no solution

working:
sub. y = 2x+5 into the second equation,
2x+5=2x-33
5=-33 （Not a valid equation)
so no solution.

Please us know if you need further help, the tutors in our centre (who are IP/GEP/RGS/NYGH/ACJC teachers) are able to help you.

Sharmum
GreenBelt
Posts: 138
Joined: Tue Nov 10,

### Re: Lower Secondary Mathematics

Need help with the following questions:-

1) 10f2 - 15f = 0

17g + 45
2) g2 + ----------- = 5
2

Not sure how to place the superscript of square thus f2 and g2.

Question 2 is truncated.

Anyone can tell me how to upload the in pic? Cos has reduced size many times and change from bmp to jpg and etc still cant post.....

tankee
Site Admin
Posts: 17926
Joined: Tue Jun 30,
Location: Singapore
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### Re: Lower Secondary Mathematics

Future Academy wrote:
tankee wrote:Kindly help with the following qn, thanks.
Without drawing the graphs, explain why the simultaneous equations
y = -2x + 5
y = 2x - 33
have no solution
Hi, is there any typo error in the question?

I am able to find the solution, which is x= 9.5 and y=-14.

......

likewise. But since it has been a while, I thought better seek help to be sure just in case it isn't a typo.

thanks.

Jmaths.SG
YellowBelt
Posts: 19
Joined: Fri Apr 01,

### Re: Lower Secondary Mathematics

tankee wrote:
Future Academy wrote:
tankee wrote:Kindly help with the following qn, thanks.
Without drawing the graphs, explain why the simultaneous equations
y = -2x + 5
y = 2x - 33
have no solution
Hi, is there any typo error in the question?

I am able to find the solution, which is x= 9.5 and y=-14.

......

likewise. But since it has been a while, I thought better seek help to be sure just in case it isn't a typo.

thanks.
A quick sketch of the graph will show that there is a solution.
I believe that it's a typo, and it probably is on either of the gradient/x-coefficient of the 2 equations.

The explanation should be because the gradient of the lines are the same (-2 OR 2; unable to determine due to typo), that means the 2 equations are parallel to each other, and therefore will never meet each other. => no solutions.