Question

I am getting different answer from the textbook please see this

Answer 1

For the first value i have 12 but the textbook says 4?

Answer 2

I got y = 12 y = 4 y =4 y =12 y= 28
is that correct?

Answer 3

y depends on x. So we say y = -x + 5, or y(x) = -x + 5.

We want to test y(4), y(2), y(0), y(-2), and y(-4).

y(4) = -(4) +5 = -4 +5 = 1
y(2) = -(2) +5 = -2 +5 = 3

Can you do y(0), y(-2), and y(-4)?

Answer 4

y=-x+5
when x=4
y=-4+5=1

when x=2
y=-2+5=3
when x=0
y=5
when x=-2
y=-(2)+5=7
when x=-4
y=-(-4)+5=9
x y
4 1
2 3
0 5
-2 7
-4 9

Answer 5

y = -x + 5
when x = 4, then y = - 4 + 5 , y = 1
when x = 2, then y = -2 + 5, y = 3
when x = 0, then y = - 0 + 5, y = 5
when x = -2, then y = 2 + 5 , y = 7
when x = -4, then y = 4 + 5, y = 9

All you do is sub the value of x into the equation to find the value of y.