Search our library of Maths GCSE questions

Top answers

Maths

GCSE

You are told that y is proportional to x^2 and that y=75, x=5. Find a formula for y in terms of x.

You know that y is proportional to x², so let y=kx² . You also know that y=75 and x=5. Substitute y=75 and x=5 into the equation y=kx² . Therefore: 75=k multiplied by 5

Answered by Anna G. • Maths tutor

2609 Views

7x + 6 > 1 + 2x

In order to solve this, we need to bring all of the x values to one side, we can do this by subtracting the 2x from both sides7x + 6 - 2x > 1 + 2x - 2x5x + 6 > 1 We then need to move the values onto...

Answered by Mala P. • Maths tutor

9276 Views

Simplify (48)^(1/2)

Simplify 48^1/2:48^1/2=(124)^1/2=(434)^1/2=(4)^1/2(4)^1/2(3)^1/2=22*(3)^1/2=4(3)^1/2

Answered by Alex N. • Maths tutor

3321 Views

What are the products when an acid reacts with a metal?

An acid and metal react to form hydrogen and a salt.
For example:
Mg + 2HCl ----> MgCl2 + H2
1 mole of magnesium reacts with 2 moles of hydrochloric acid to form 1 mole of magnesium chl...

Answered by Kate F. • Maths tutor

2522 Views

Two simultaneous questions are given as 3x+2y = 9, and x-2y = -5. Find the values for x and y

Can be solved in 3 ways:
Substitution - can rearrange equation 2 to for x = 2y-5. Then substitute this in to equation 1 to form, 3(2y-5)+2y = 9. Multiply out the brackets and rearrange to form 8y = 2...

Answered by Aman S. • Maths tutor

4362 Views