Algebra 9
1 mark · EasyState how you can check that your solutions to a pair of simultaneous equations are correct.
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Show answer
Substitute both values into the original equations to see if both are satisfied.
Also accept: Check by substituting into both equations; See if both equations are true for those values
Common mistakes: Substituting into only one equation
Show mark scheme and worked solution
Marking points
B1 · 1 mark · States that both values must satisfy both original equations (by substitution or equivalent).
Worked solution
Substitute your values of x and y into both equations to check that both are true.