How? Explaining number 22: Well, let’s disprove each one of them. A.) A is saying 6x=7. Even if we simplify that, it wouldn’t make any sense in what we are trying to do. That equation is equal to x=0.86(estimated to nearest tenth)
B.) B says that 6x=3. When we simplify this, we get x=0.5. That isn’t the number we want, so we know B isn’t right
C.) C is equivalent to 2x+2=6. Let’s simplify since it is multi-step. 2x+2=6 2x=6 x=3 Since we want x to be six, this wouldn’t be the answer either.
D.) D is saying 2x=12. When simplified, this becomes x=6. BINGO THERE IS OUR ANSWER
Explaining 23: For this, I also used process of elimination.
Remember that x is equal to 2.5
A.) x+3=5.5
2.5+3=5.5 5.5=5.5 That works.
B.) 2x=5 2(2.5)=5 5=5 That works.
C.) 2.5/2=1.25 1.25=1.25 That works
D.) x-10=7.5 2.5-10=7.5 -7.5=7.5 THAT DOESNT WORK THERE IS OUR ANSWER
C (third graph, the parabola); To find if it is a function or not draw a vertical line on the graph. If the vertical line could never intercept the figure more than once anywhere on the graph then it is a function.
