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what is x+24=15

x+24-24=15-24 x=15-24=-9
RW
Answered by Ruyuan W. • Maths tutor
5850 Views

A straight line goes through (0,1), (2,5) and (4,9). The equation of the straight line is y=2x+1. Is the point (7,12) on this straight line?

First we'll figure out what the numbers in the co-ordinates mean. On the point (7,12) x= 7 and y=12. - The equation of the line is in the form of y=mx + c so for the point to be on the line, the y value must...
HC
Answered by Harriet C. • Maths tutor
9597 Views

How do you solve a quadratic equation? I always forget how to do that!

x 2 +4x+3=0 The first step is to factorise. To do this you need to find a pair of factors of 3 that add together to make 4. I recommend listing the factors of 3 to start with. Don't forget the negatives! 1 a...
HD
Answered by Hannah D. • Maths tutor
3490 Views

Solve: x^8-17x^4+16

You should treat the question as you would a normal quadratic and complete the square. First you should look at the factors of 16 and see which pair would result in the -17x; you can see that it would be -1 ...
JG
Answered by Jessica G. • Maths tutor
12685 Views

3(a+4)=ac+5f. Rearrange to make a the subject.

3(a+4)=ac+5f 3a+12=ac+5f 3a-ac=5f-12 a(3-c)=5f-12 a= (5f-12)/(3-c)
RR
Answered by Rumana R. • Maths tutor
4692 Views