Question

Is (-10, 10) a solution to this system of equations?

18x + 20y = 20
20x – 2y = 9
yes
no

Answer 1

No

(The first system is correct but the second one is wrong)

Explanation:

You can plug (-10,10) into these equations

a) 18(-10)+20(10)=20

-180+200=20

20=20

b) 20(-10)-2(10)=9

-200-20≠9

-220≠9