Step-by-step explanation:
the most common form of line equation is
y = ax + b
a is the slope of the line. it is expressed as the ratio
y coordinate change / x coordinate change
when going from one point to the other.
b is the y-intercept (the y value when x = 0).
once we have the slope, we get b by using the coordinates of one of the given points as x and y in the equation and since for b.
2 points are marked already :
(-3, 4) (3, -4)
x changes by +6 (from -3 to 3)
y changes by -8 (from 4 to -4)
the slope is -8/+6 = -8/6 = -4/3
the y-intercept is also clearly visible on the chart : the line crosses the y-axis precisely at (0, 0).
so, the y-intercept is 0.
We know that:
3x + 10y = 7
We also know that:
x - 10y = 29
Which means that:
x = 29 + 10y
If, x = 29 + 10y,
3(29 + 10y) + 10y = 7
3*29 + 30y + 10y = 7
3(20+9) + 40y = 7
60 + 27 + 40y = 7
87 + 40y = 7
40y = 7 - 87
40y= -80
y=(-80)/40
y=-2
Answer y=-2.
If y=-2,
x-10(-2)=29
x+20=29
x=29-20
x=9
Let's see if these results are true:
3(9)+10(-2)=7
27-20=7 (Correct)
-----------
9-10(-2)=29
9+20=29 (Correct)
Answer once again:
y=-2
He is left with 12
1/5 of 10 is 2 so he was left with 8
2*2 is 4, and 8+4 is 12!
Multiply by .22 then add that answer to what you multiplied. For example, you need to increase 100 by 22%. 100 × .22 = 22. 100 + 22 = 122
Answer:
Step-by-step explanation:
Strike with 4th table
