A few days ago
Algebra homework help?
you have to solve the equation for y. then find the value of y for the given value of x. there are two answers.
these were the only ones i got stuck on. thanks for the help!
xy-3x=40; x=5
7x-xy= -18; x= -4
3xy-28=16x; x=4
9y+6xy=30; x= -6
4 – 2xy=15; x= -1
4x+7y+5xy=0; x=1
Top 3 Answers
A few days ago
Favorite Answer
First create a formula for y. Enclose number sets in brackets to help you keep track of what you’re doing.
xy-3x =40
xy=40+3x
y=(40+3x)/x
Then substitute x=5
y=(40+[3×5])/5
y=(40+15)/5
y=55/5
y=11
Double check original formula
xy-3x=40
5y-(3×5)=40
5y-15=40
5y=40+15
5y=55
y=55/5
y=11
Now you know you’ve got it right.
0
A few days ago
xy-3x=40; x=5
(5)y-3(5)=40
5y-15=40
5y=40+15
5y=55
y=11
7x-xy=-18 ; x=-4
7(-4)-(-4)y=-18
-28+16y=-18
16y=-18+28
16y=10
y=10/16=5/8
the next several are much the same… try them yourself
4x+7y+5xy=0; x=1
4(1)+7y+5(1)y=0
4+7y+5y=0
4+12y=0
12y=-4
y=-4/12=-1/3
0
A few days ago
first you have to isolate the y value. get the y on one side of the equals sign and everything else on the other. that’s how you solve for y.
then plug in your x value and solve.
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