You can multiply the second equation by -2
-5x + y = 15 everything by -2
10x - 2y = -30
now you can solve them
2x + 2y = -6
10x - 2y = -30
y cancels
2x= -6
10x = -30
12x = -36
/12. /12
x = -3
now to solve for y you substitute x for -3
-5(-3) + y = 15
15 + y = 15
-15 -15
y= 0
Answer:
D- Neither graph is a funvtion.
Step-by-step explanation:
A function can only have one input to one output. These have more than one output for each input. You can also do the vertical line test, if it touches more than two points at the same time while going horizontally across, it is not a function.
2.5(10x - 16) = 5
2.5 is multiplying on the left, then it will divide on the right
10x - 16 = 5/2.5
10x - 16 = 2
16 is subtracting on the left, then it will add on the right
10x = 2 + 16
10x = 18
10 is multiplying on the left, then it will divide on the right
x = 18/10
x = 1.8
PEMDAS so, (10*1)=10 + (20*2)= 40+10= z= 50
