Solve the simultaneous equations algebraically: y = x+19 AND y = x^2 + 4x +1.

We have one linear and one quadratic equation here. Since we have a quadratic, we will have two sets of solutions. Let's solve by substitution. Substitute equation (1) into equation (2), which yields:x + 19 = x^2+4x+1OR 0 = x^2 + 3x - 18To solve this quadratic to find our x values we must first factorise, which gives:0 = (x+6)(x-3)It must follow that:x = -6 OR x = 3.Sub these two distinct real solutions into equation 1, we will get our corresponding y value:x = -6, y = 13 OR x=3, y=22.

LD
Answered by Liam D. Maths tutor

4348 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

How do you break down a wordy question (e.g. Aled has three concrete slabs. Two slabs square, of length x, & the third rectangular of dimensions 1m & x+1m. Show 2x^2 +x-6=0 & Solve this)


Find the length of X and Y of these two right angled triangles (pictured) and prove their congruence, stating the rule.


Solve x^(2)-x-12


Solve x^2+8x-5 = 0 by completing the square.


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

MyTutor is part of the IXL family of brands:

© 2026 by IXL Learning