I'm really struggling with these. Can someone teach me step by step. Pretty please I need to know!?! Like now please!!!!!
x+3y=11
5x+6y=1
And
-3y-y=-15
8x+4y=48
I need help please I don't get it!?! Systems and probability review.?
2015-03-24 4:04 am
回答 (1)
2015-03-24 4:30 am
x = 11 -3y , substitute into equation2
5(11-3y)+6y=1
55-15y+6y=1
55-9y=1
-9y = 1-55
-9y=-54
y = -54/-9
y=6 , x = 11-3(6)=11-18 = -7
answer x=-7 , y = 6
2/
Is -3x-y=-15 ?
5(11-3y)+6y=1
55-15y+6y=1
55-9y=1
-9y = 1-55
-9y=-54
y = -54/-9
y=6 , x = 11-3(6)=11-18 = -7
answer x=-7 , y = 6
2/
Is -3x-y=-15 ?
收錄日期: 2021-04-21 01:32:24
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20150323200418AAzNb6i