SPM Additional Mathematics 2019, Paper 2 (Question 1)

Question 1:Solve the simultaneous equations x + 2y = 1 and 3 x − 2 y =5. Give you answer correct to three decimal places. [5 marks]Solution: x+2y=1 x=1−2y ………… (1) 3 x − 2 y =5 ×  xy, 3y−2x=5xy ………… (2) Substitute (1) into (2): 3y−2( 1−2y )=5y( 1−2y ) 3y−2+4y=5y−10 y 2 10 y 2 +2y−2=0 5 y 2 +y−1=0 a=5, b=1, c=−1 y= … Read more