Answer:
1) When x is 1, y is 4, and vice versa
2) When x is -6, y is 42, and when x is 7, y is 114
3) When x is -2, y is 2, and when x is 8, y is 42
Step-by-step explanation:
1)
which can be rearranged as 
.
Substituting this lone y into the first equation, you get:
Move everything to one side:
Factor:
2)
which can be rearranged as 
.
Let's use elimination this time and subtract the first equation from the second:
Factor:
3)
Let's set the two equations equal to each other through substitution:
Move everything to one side:
Factor:
Hope this helps!
Answer: -15x+6
Step-by-step explanation:
c(x) = 3x - 6
d(x) = -5x + 4
(cod)(x)=
c(d(x))=
c(-5x+4)=
3(-5x+4)-6=
-15x+12-6=-15x+6
Answer:
n = 6.2/-10.4=0.5962
Step-by-step explanation:
What is the value of n in the equation. we would make n the subject formula -1.2(2n+4)+6=-9+4(2n+1)
Opening the brackets,
-1.2×2n -1.2×4 + 6= -9 +4×2n + 4×1
-2.4n -4.8 +6 = -9 +8n + 4
-2.4n -4.8 +6 = -9 + 4 + 8n= -5+8n
Collecting like terms
-2.4n-8n = -5+4.8-6
-10.4n =-6.2
n = -6.2/-10.4= 0.5962
Let's check, put n= 0.5962 in the equation
-2.4n -4.8 +6 = -9 +8n + 4
Lefthand side
-2.4×0.5962-4.8+6= -0.230
Right hand side
-9+ 8× 0.5962 +4
=-9 +4.7696 +4
=0.230
Right hand side = left hand side
Answer:
Stop asking others for the answer little girl, and do the work yourself
