Answer:
y=x-2
Step-by-step explanation:
4-0=4 = (change in y)
2--2=4 = (change in x)
change in y/change in x=4/4=1=x
gradient = x
y=x+c
Subtitute any coordinate
2=4+c
c=-2
so
y=x-2
Answer:
x is equal to -2, and y is equal to 2.
Step-by-step explanation:
You can solve this type of question by solving one of the equations for a given variable, and substituting it into another.
Because both of these are definitions of y, we could simply say, y = y, and thus:
x + 4 = -2x - 2
3x = -6
x = -2
This tells us also that y, being equal to x + 4, must equal 2
We can find the same solution by solving one of them for x, then substituting that into the other. We know:
y = x + 4
so we can also say:
x = y - 4
If we substitute that into the other:
y = -2x - 2
y = -2(y - 4) - 2
y = -2y + 8 -2
3y = 6
y = 2
which we can then plug into either of the original equations to solve for x:
y = x + 4
2 = x + 4
x = -2
Answer:
a= 3.9 and b r - 5.5
Step-by-step explanation:
2a+3b=6
Let's write this in the form of b= (Solve for b).
3b+6 =2a
3b= 2a - 6
b = (2a - 6)/3
b= 2/3a - 1/2
Now substitute this in the original equation.
2a+3b=6
b= 2/3a - 1/2
2a + 2(2/3a - 1/2) - 12
2a + 4/3a - 1 - 12
Try to write a in terms of thirds. So use 2a =6/3a
6/3a + 4/3a - 1 - 12
10/3a -13
Solve for a means write in the form of a =
10/3a -13
10/3a =13
multiply both sides with 3/10
3/10 * 10/3a =. 3/10 * 13
30/30 a = 39/10
a = 39/10
Now substitute a = 39/10 in b= 2/3a - 1/2
b= 2/3a - 1/2
a = 39/10
b= 2/3 * 39/10 -12
b =78/30 - 12
b= - 5.5
this equation is not funcion.
Step-by-step explanation:
if u make a graph and u aline them with dots 2 or more dots will cross each other witch makes it not function:)