Answer:
y = 4
x= 7
Step-by-step explanation:
First you would rearrange the first equation x-7y=-21 and make x the subject:
x= -21 +7y
Then substitute x into the 2nd equation to find y:
13x - 7y= 63
13(-21+7y) - 7y = 63
-273 + 91y -7y = 63
-273 + 84y=63
84y = 63 + 273
84y = 336
y = 4
Once you have y you can substitute this into any of the original equations to find x, for example:
x - 7y = -21
x - 7(4) = -21
x - 28 = -21
x = -21 +28
x= 7
Answer:
The domain is 2 and the range is none
Answer:
$2.44/gal
Explanation:
$58.56/24gallon/
Answer:
x = 5
Step-by-step explanation:
When two straight lines intersect, four angles are formed. The angles that are directly opposite of each other are equal. Since the angles are equal set the values equal to each other and solve for x.
5x - 5 = 2x + 10
5x - 5 - 2x = 2x + 10 - 2x
3x - 5 = 10
3x - 5 + 5 = 10 + 5
3x = 15
3x/3 = 15/3
x = 5