Answer:
x=-5
y=5
Step-by-step explanation:
Explanation is in picture (Where the lines cross is your answer)
Tip: Try using desmo calculator. Where the lines cross is your answer so all you need to do is type in your equations
Zeros are:



Looks like only

and

are offered as answers, though.
Answer:
4
Step-by-step explanation:
3x +7 = x + 15 subtract x from both sides
2x + 7 = 15 subtract 7 from both sides
2x = 8 divide both sides by 2
x =4
Would use commutative property
ab = a*b = b*a = ba
equivalent expression = ba