Answer:
Step-by-step explanation:
Answer-116
Well to set up a substitution equation, you need to make sure you have something you can sub in that's identical in both equations.
we have
3x-y=5
x-4y=-24
what's in common? x and y.
take one of the equations and solve for x or y like so (i'm doing y)
3x-5=y
then substitute the whole 3x-5 equation for y in the second equation. it is quite similar to how you would normally substitute a number like if y=5, then you substitute 5 for y in the second equation, but instead the "5" is an equation "3x-5"
x-4y=-24
x-4(3x-5) = -24
Now that you got it set up, you just need to solve for x and once you got x value, plug the x value in the original equations to find y.
Answer:
59
Step-by-step explanation:
1) so you start with the mean being 72x5=360
2)100+42+87+66=295
3) 360-295=65
(you get the 5 from the amount of numbers there are) P.S sorry if I'm wrong or this doesn't help
Answer:
It is negative ten-
Step-by-step explanation: