Solve the simultaneous equations: 2x + y = 18 and x - y = 6
We need to find a value of x to sub into equation 1, so add y to both sides of equation 2: x = 6 + y. Then sub this into the x value of equation 1 and solve to find y: 2(6 + y) + y = 18. 12 + 2y + y = 18. 3y + 12 = 18. 3y = 6. y = 2. To find the x-value, sub in this value of y into equation 2 and solve: x - (2) = 6. x = 8.
AW
Related Maths GCSE answers
All answers ▸Suppose you are given a rectangle where the length is equal to 2x+4 and its width is equal to 3x-2. Assuming that the perimeter is equal to 54 cm, what's the value of x?
Expand and simplify x(x+4)(x-5)
How would you work out the length of an hypotenuse, if the length of the opposite side is 3 cm and the length of the opposite side is 4 cm?
A right-angled triangle has an adjacent of (x + 1) and (x - 1). (a) Find the length of the hypotenuse in terms of x. (b) Explain why the triangle can't be an isoceles triangle.