Solve 8x + 9y = 3 and x + y = 0.
We have 8x + 9y = 3 [1] and x + y = 0 [2].We can make x or y the subject. Take y as subject we have y = -x [3].We substitute [3] into [1] and get 8x - 9x = 3 --> -x = 3 --> x = -3.Substituting x = -3 into [2] we get -3 + y = 0 --> y = 3.Final answer: x = -3 and y = 3.
TO
Related Maths GCSE answers
All answers ▸Solve the following simultaneous equations: x^2 + y^2 = 12, x - 2y = 3
A linear sequence starts a + 2b, a + 6b ,a + 10b ,…….. ,…….. The 2nd term has value 8. The 5th term has value 44. Work out the values of a and b
2 chocolates weight 250g, there are 220 calories in 100g of chocolate. How many calories are in one chocolate?
The equation of the line L1 is: y = 5x-4. The equation for line L2 is 2y-10x+16 = 0. Show that these two lines are parallel.