Let's say Mary's brother's age is x and Mary's age is y
(1) x = 3y - 5
(2) x + y = 39
Now if we substitute equation (1) into equation (2) we get:
3y - 5 + y = 39
4y = 44
y = 11
Therefor Mary is 11 years old
the inverse function just changes the coordinates
if f goes through (a,b), then f^-1 must goes through (b,a)
Answer:
slope = 1
y-intercept = (0 , -4)
x - intercept = (4 , 0)
Step-by-step explanation:
y = mx + b
m = slope
b = y-intercept
Note that there is no number besides the x. When this happens, the slope is to be assumed as 1.
The number (and sign) that replaces the b is the y-intercept. In this case, it is (0 , -4).
The x-intercept is the point in which you intercept the y-line at 0. Plug in 0 for y, and solve for x:
0 = 1(x) - 4
0 = x - 4
0 (+4) = x - 4 (+4)
x = 4
x-intercept = (4 , 0)
Answer:
(10,0)
Step-by-step explanation:
4x - 5y = 40
To find the x intercept, set y =0 and solve for x
4x - 0 = 40
4x= 40
Divide by 4
4x/4 = 40/4
x = 10
The x intercept is 10
(10,0)
Answer:
24
Step-by-step explanation:
1.-12
2.-12×2=-24
3.24
