The number is 12 because the equation would be:
3x+4x=84
7x=84
7x/7=84/7
x=12
Answer:
x=6; y=-3 (6;-3)
Step-by-step explanation:
9x=54
x=6
If you substitute...y= -3
For this case we have a function of the form
. Where:

By definition, the domain of a function is represented by the set of values of the independent variable, x, for which the value of the variable y can be calculated.
For its part, the range is represented by the values of "and".
So:

Thus, the range is {-3,1,2}
Answer:
{-3,1,2}
The second choice
For it’s just rearranged
Answer:
b
Step-by-step explanation:
Given
12x+ 8 = 10x + 18 ( subtract 10x from both sides )
2x + 8 = 18 ( subtract 8 from both sides )
2x = 10 ( divide both sides by 2 )
x = 5
The equation has one solution