niescarlosj
11.10.2019 •
Mathematics
4x-3y=-40
9x+5y=4
x=?
y=?
how do i do this?
Solved
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Ответ:
20x -15y = -200
multiply the second equation by 3
27x +15y =12
add the 2 new equations
20x-15y +27x +15y = -200 +12
47x = -188 (devide each side by 47)
x = -4
substitute x with -4 in any equation you like (I'll choose the second)
9*(-4) +5y =4
-36+5y=4 (add 36 to each side)
5y= 40
y= 8
Ответ:
step 2 he divded the 8 by 2
Step-by-step explanation:
There IS a mistake
8+2 is 10
so 10+3 is equal to 13