Solve the simultaneous equations: (a) y - 2x = 6; (b) y+2x = 0.
-
rearrange equation (a) to be: y = 6 + 2x. Substitute this into equation (b) to get: (6 + 2x) + 2x = 0
-
rearrange this to get: 6 + 4x = 0. Simplify to get x = -(6/4). Get the value for x to be: x = -1.5.
-
substitute this x value into equation (b) to get the value for y, hence we get: y + 2(-1.5) = 0; y = 3.
FM
Related Maths GCSE answers
All answers ▸Factorise fully the following: 12x^3 + 3x^2 + 15x
The nth term of a sequence is 7n-4. Write down the 4th term and the 10th term of the sequence. The first four terms of a different sequence are 9, 13, 17, 21. Find an expression for the nth term of this sequence.
Solve the simultaneous equations: y=3x+2, x^2+y^2=20
How do you factorise the algebraic expression x^2 +5x+ 6?