Answer:
3.456
Step-by-step explanation:
one meter is 100 millimeters
4(4x + 6) - 7 = 77 - 4x......distribute thru the parenthesis
16x + 24 - 7 = 77 - 4x ...simplify
16x + 17 = 77 - 4x ...addition property of equality....add 4x to both sides
16x + 4x + 17 = 77 ...subtraction property ...subtract 17 from both sides
16x + 4x = 77 - 17...combine like terms
20x = 60 ....division property....divide both sides by 20
x = 60/20
x = 3
First you plug the y into the equation you are substituting it into, this gives you
4x-3(-2)=18
multiply the -3 by the -2 to get 4x+6=18
Subtract the 6 from both sides to get 4x=12
Finally divide by 4 to get x=3