Can someone help me please

4. c

5. a

Step-by-step explanation:

To solve for x and y, you do it simultaneously.

You have to make sure one variable (can be any, I usually choose y) is the same in the other equation. This way, you can cancel it and find the other variable. Once you find the other variable, you substitute that value into one equation and then you can find the value of the other variable.

answer: all of the odd numbers were opened

the first person was the one that was opening all of the lockers. since one is odd, this causes all of the odd number lockers to be opened in the end.

y = 5x + 17

step-by-step explanation:

a perpendicular line will be the opposite reciprocal slope of the given equation.   the slope given is -1/5 so the opposite reciprocal is 5

find b:

7 = 5 (-2) + b

7 = -10 + b

17 = b

write equation

y = 5x + 17