This is quiet simple. i like to use a method my math teacher calls "plug and chug". we know that y= 4x +2 some people call this the substitution method but it has the same concept. now that we know what y equals, we plug it into teh equation: (4x+2) -x=17 then we "chug it": 4x+2-x=17 then we have to isolate x. add the x's: 5x+2=17 in order to isolate x subtract 2 from both sides: 5x=15 now to isolate again divide both sides with 5: x=3 so x is 3. bow we plug that into what y is; y=4 (3) +2 y=14 so: x=3 y=14 (to double check plug and chug into the first question . if x and y are correct, you will get 17)
