Solve x + y + z = -6 -2x – 2y – 2z = 12 5x + 5y + 5z = -30 solve x + y = 6 y + z = 0 x + y – z = 4

here we have given three system of linear equations.

x+y+z=-6

-2x-2y-2z=12

5x+5y+5x=-30.

here three unknowns will have same value x=y=z .

the x+y+z=-6

x+x+x=-6=3x=-6,x=-2

we know that x=y=z .

then x=-2 y=-2 and z=-2.

for part b we have three equation x+y=6

y+z=0

x+y-z=0

we need to use substitution method.

in second equation we have y+z=0 it mean y=-z

we need to plug y=-z in any one of the equation to find other value.

in first equation we have x+y=6 it becomes x-z=6

then in third equation we have x+y-z=4 we will rewrite this as x-z+y=4

we know that x-z=6

so 6+y=4

y=-2

y+z=0 =-2+z=0

z=2

we know x+y=6

x+(-2)=6=x=8.

x=8 y=-2 z=2

answer: 4/6 =5/7.5

step-by-step explanation: it is based on scale and the scale between the two is 1.25. the answer is correct but i dont know if i explained it right

d

step-by-step explanation:

hello and welcome!

so, when we see the words "proportional" along with a table, we need to know that we're looking numbers that divide by the same thing.

looking at this table, we simply have to do a trial and error, and divide to see which numbers have the same quotient. if you look at choice a & c, they both have equal quotients for three of the numbers, with one exception, so those can't be the answer. looking at b, there is no similarity, so that can't be it. then, we see d; if you divide all the numbers in the table, you'll see that they all divide by two, which is a proportional relationship, and our answer!

also, always remember that the x will always be the number that goes into y, and somewhere behind this table, is a formula. for this specific table, the formula would be:

since our x-value is being divided by two to get the y-value. and if they were to ask for more numbers in the series, this is the formula you would use to find them.