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solve the simultaneous equations , 5a+2b=23 & 9a-2b=19, algebraically.

find sum of both equations: 14a=42, therefore a=3, substitute 'a' into an equation: (5x3)+2b=23, therefore 2b=8, therfore b=4
RP
Answered by Rohan P. • Maths tutor
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Adam is going to get a loan of £ 720 to help pay for the holiday. Adam will have to pay back the £ 720 plus interest of 15 %. He will pay this back in 12 equal monthly installments. How much money will Adam pay back each month?

From the question, we learn that Adam has take out a loan of £720. He will be paying back the loan in 12 monthly installments of the same amount each time. We are also told he must pay the loan back with 15%...
RC
Answered by Riaz C. • Maths tutor
5469 Views

Solve: sin(x) = 0.5, in the interval of 0 < x < 360 degree.

sin(x) = 0.5 x = arcsin(0.5) x = 30 degrees , 150 (180-30) degrees
PA
Answered by Priyanka A. • Maths tutor
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Explain the general formula for a sraight line?

y=mx+c m = gradient of the line c = the y intercept x and y are variables
NM
Answered by Ndaba M. • Maths tutor
4013 Views

There are 40 pencils in a box. There are 15 pens in a packet. John gives one pencil and one pen to each person at a conference. He has no pencils or pens left. How many boxes of pencils and how many packets of pens did John buy?

Multiples of 15: 15, 30, 45, 60, 75, 90, 105, 120 Mulitples of 40: 40, 80, 120 This means that there are 120 people at the conference, and that he sold 3 boxes of pencils (40x3=120) and 8 boxes of pens (15x8...
AP
Answered by Anastasia P. • Maths tutor
24536 Views