Potatoo's answer to Anonymous's Secondary 2 Maths Singapore question.
done
{{ upvoteCount }} Upvotes
clear
{{ downvoteCount * -1 }} Downvotes
x+y=52
3x+2y=139 -(1)
x=52-y -(2)
substitute eqn (2) into eqn (1)
3(52-y)+2y=139
156-3y+2y=139
y=17
When y=17, x=52-17
x=35
3x+2y=139 -(1)
x=52-y -(2)
substitute eqn (2) into eqn (1)
3(52-y)+2y=139
156-3y+2y=139
y=17
When y=17, x=52-17
x=35
Date Posted:
3 years ago
360 Tutoring Program