Solve the simultaneous equations: 2x + y = 12; x - y = 6
We add the two equations together (left-hand sides and right-hand sides separately). By doing this we get: 2x + y + (x - y) = 12 + 6. By rearranging and simplifying: 3x = 18.If we divide both sides by 3 we get: x = 6.By substituting the value of x into the second equation we get: 6 - y = 6 which makes y = 0.The solution is x = 6 and y = 0.
RD
Related Maths GCSE answers
All answers ▸OPG is a triangle. N is point on OG such that ON : NG = 2 : 3. OP = a, PG = b. Express ON in terms of A and B.
Five numbers have a mean of 9.4 . Four of the numbers are 3, 5, 10 and 12. Work out the range of the five numbers. ( 4 marks )
Solve the equation p + 15 = 2(4p − 3)
Find x when 2x^2-4x-6=0