Question

use substitution to solve the system of equation
3x-3y=30
-2x+8y=-26
a.4,-6
b.9,-1
c.17, 1
d.infinitely many solutions

Answer 1

To solve a System of equations by substitution, we find the value of one variable \((\text{say } x)\) in one equation in terms of the other \((y)\).
What would the first step be in achieving this?

Answer 2

im being timed on this test and i really dont know...

Answer 3

3x-3y=30----- (1)
-2x+8y=-26-----(2)
_______________
x+5y=4
or,x=4-5y
now from equation 1 we can set the value of x
3(4-5y)-3y=30
or,12-15y-3y=30
or,18y=30-12
or,18y=18
or,y=1
now from equation 2 we can find
-2x+8=-26
or,-2x=-26-6
or,-2x=-32
or,x=16

Answer 4

okay ..

Answer 5

okay ..

Answer 6

thank u