Solve algebraically the simulations equations: x^2+y^2=25 and y-3x=13
x2+y2=25; y-3x=13; x2+(13+3x)2=25; x2+9x2+78x+169=25; 10x2+78x+144=0; 5x2+39x+72=0; (5x+24)(x+3)=0; x=-24/5 and y=-7/5;x=-3 and y=4
NC
Related Maths GCSE answers
All answers ▸Expand completely: (3a-6)(a+3)
ABC is an acute-angled triangle. BA=7cm and BC=8cm. The area of triangle ABC is 18 cm^2 . Work out the size of angle BAC. Give your answer correct to 3 significant figures. You must show all your working.
A is (2, 12) and B is (8, 2) Calculate the midpoint of AB.
Expand (2x+4)(x-3)