Question

Use addition or substitution to find the value of y for this set of equations.
x + y = 14
x = 6y

Answer 1

Substitution first:

to the 1st equation lets subtract x from both sides
x-x+y = 14 - x
y=14 - x now we know what y is = to lets substitute that in the 2nd equation

x = 6(14 - x) multiply 6 by all the terms in the bracket
x = 84 - 6x add 6x to both sides
x + 6x = 84 - 6x + 6x combine our terms
7x = 84 divide 7 to both sides
7x/7 = 84 /7
x = 12
we know from before y = 14 - x plug in x
y = 14 - 12
y= 2

Answer 2

thank you.

Answer 3

do you want to see addition?????????