Solve the simultaneous equations. 2x+5y=-4 and 7x+y=19
This can be solved using either substitution or elimination. I think this question is best approached by elimination.By elimination: Multiply the second equation by 5. The minus the first equation from the new second equation. This will give 33x=99. This can be solved as x=3. When substituting this into the first equation, we get 6+5y=-4, so 5y=-10 and y=-2.
NW
Related Maths GCSE answers
All answers ▸135 is 3/8 of a number. Work out the number.
Show clearly that (3√3)^2 = 27
Solve this quadratic equation 3x(squared)-7=101
How do you calculate ratios? Example question: 'White paint costs £2.80 per litre, Blue paint costs £3.50 per litre, White paint and blue paint are mixed in the ratio 3:2. Work out the cost of 18 litres of the mixture [4 marks]' AQA Mathematics (8300)