Solve the following simultaneous equations: 2x + y = 17, x - y = 4

2x + y = 17 x-y = 4 ---> x = 4 + y2(4+y) + y = 17 ------> 8 + 2y + y = 17 -----> 8 + 3y = 17 --------> 3y = 9 -----> y=3 x = 4+y ------> x = 7

GN

Related Maths GCSE answers

All answers ▸

How can i add algebraic fractions, such as 1/(1-x) + 2/x


Peter is 180cm tall, correct to 2 significant figures. Alice is 150cm tall, correct to 2 significant figures. What is the upper and lower bound of the difference in their heights?


How do I work out the exact value of a number which is expressed as an indice, for example 81^-1/4


A t-shirt is in the sale section of a store. It has 20% off and the new sale price is £12. What was the original price of the t-shirt?