Question

Use elimination to solve the system. What is the value of y ? 3x+5y=16 and 8x-5y=28

a) 4
b) -6
c) 0.8
d) 5

Answer 1

adding the 2 equations
11x = 44
x = 4
replace x in first equation by 4:
3(4) + 5y = 16
5y = 4
y = 0.8

Answer 2

=> x=4

Now, put the value of x in any one of the equations and you'd get y ..