Find the coordinates of the point where lines 3x+5=y and 6y+x=11 intersect
To find the coordinates of the point, we have to solve the equations simultaneously. To do this, we need the same number for the coefficient of x or y in each equation. Arbitrarily, we will chose to match the x coefficients. This means we have to multiply equation 2 by 3 resulting in2) 18y+3x=33We now rearrange for 3x3x=33-18yand substitute into equation 1(33-18y)+5=yWe now solve for y to give y=2We sub this back into equation 2) to give6(2)+x=11therefore x=-1 and the coordinates are (-1,2)
AP
Related Maths GCSE answers
All answers ▸See answer section
When working with probabilities why is it sometimes necessary to add and sometimes to multiply?
Dan works 5 days a week. Is it cheaper to use car or bus? Bus weekly ticket = £19.50. Car drive is 24.2 miles, car does 32.3 miles per gallon of petrol, which costs £1.27 per litre. Use 1 gallon = 4.5 litres
Solve these simultaneous equations (1) 12x + 3.5y = 32 (2) 8x + 3y = 24