Topic 5 Review of Systems (19 questions) -- Question 17

Question

Solve the system of equations using subtraction.

4x−7y=17

10x−7y

______

Answer 1

three seems to be a missing part of the 2nd equation

4x - 7y = 17

10x-7y = ?

10x-7y = z

4x-7y = 17

subtract to get

6x = z-17

x = (z-17)/6

y = (4x-17)/7

IF z = 17, then x =0, y=-17/7

IF z =23, then x =1, y = -13/7,

IF z= 29, then x=2, y=-9/7