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primary 6 | Maths
| Data Analysis
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Date Posted: 2 years ago
Views: 387
algebra
① 180+x = 150+y
② 3(210-x) = 560-y
①+② ⇨
3(210-x)+180-x = 150+560=710
x = 50
① ⇨ 180+x = 150+y
y = 80
x+y = 130 (Ans)
Chk
if x = 80 , y = 110
✓ ① 180+x = 150+y ⇨ 260=260
✗② 3(210-x) = 560-y ⇨ 390≠450
if x = 50 , y = 80
✓ ① 180+x = 150+y ⇨ 230=230
✓ ② 3(210-x) = 560-y ⇨ 480=480
① 180+x = 150+y
② 3(210-x) = 560-y
①+② ⇨
3(210-x)+180-x = 150+560=710
x = 50
① ⇨ 180+x = 150+y
y = 80
x+y = 130 (Ans)
Chk
if x = 80 , y = 110
✓ ① 180+x = 150+y ⇨ 260=260
✗② 3(210-x) = 560-y ⇨ 390≠450
if x = 50 , y = 80
✓ ① 180+x = 150+y ⇨ 230=230
✓ ② 3(210-x) = 560-y ⇨ 480=480
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