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Find values for x and y from two simultaneous equations: 2x + y = 5 and 3x + y = 7

Rearrange one of the equations to make y the subject:y = 5 - 2x Substitute y into the other equation: 3x + 5 - 2x = 7 x = 2 y = 5 - (2 x 2) y = 1
MV
Answered by Marco V. • Maths tutor
3942 Views

Expand and simplify (3X+9)(X-6)=0

When expanding brackets, we need to make sure each of the terms in the first bracket are multiplied by all the terms in the second bracket (and vice versa). To make sure nothing is missed, we can used the FO...
WA
Answered by Wonu A. • Maths tutor
4247 Views

express 63 as a product of its prime factors

Firstly, it is important to understand what a prime number is. A prime number is one that is only divisible by 1 and itself. Thus, expressing 63 as a product of prime factors means putting it into a form whe...
KG
Answered by Kiesha G. • Maths tutor
28195 Views

What is the square root of 25?

The Answer is +5 or -5. A lot of people make the common mistake of forgetting -5, since two negatives multiplied make a positive.
ZM
Answered by Zahid M. • Maths tutor
4137 Views

Perimeter of isoceles triangle is 24cm. Sides 'x' = x + 3, side 'y' = x + 2, calculate the area

Area isosceles = h b/2 = h y/2Perimeter = 24x+3+x+3+x+2 = 243x + 8 = 243x = 16x = 16/3h^2 = (x+3)^2 - ((x+2)/2)^2h^2 = 56h = 2 root14area = 2root14*(x+2)/2area = 13.719 to 1dp
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Answered by Charlie B. • Maths tutor
3223 Views