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jonathanmagana112002
13.10.2020 •
Mathematics
Solve for x:
-42 = -7x
Solved
Show answers
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Ответ:
x=6
Step-by-step explanation:
-7x= -42
x= -42/-7
x=6
Ответ:
x=6
Step-by-step explanation:
-42= -7x divide -7 on both sides
6=x negatives cancel out
x=6 flip (not necessary but teachers like it this way)
Ответ:
A)
Step 1
Substitute "y= 4x-1"
[4x-1=8x-9}
Step 2
Isolate x for 4x-1 = 8x-9
• 4x-1 = 8x-9
Add 1 to both sides
• 4x-1+1 = 8x-9+1
Simplify
• 4x = 8x-8
Subtract 8x from both sides
• 4x-8x = 8x-8x-8
Simplify
• -4x = -8
Divide both sides by -4
• -4x/4 = -8/4
Simplify
• x = 2
For y = 4x-1
Substitute x=2
Therefore; y = 4(2)-1
y= 8-1
y= 7
Solution: x = 2, y = 7
B) The lines representing the two equations would intersect at (2,7). This is true because both coordinate points fulfill the equations shown above