Step 2...first error...when distributing through the parenthesis, u multiply, not add.
4(2x - 4) = 8 + 2x + 8 =
8x - 16 = 16 + 2x <== correction
Answer:
Cool
Step-by-step explanation:
Answer:
c
Step-by-step explanation:
because it's her extraneous uncontrolled variable
Answer:
use -9 to multiply the first equation
use -4 to multiply the second equation.
Step-by-step explanation:
5x-4y=28.....eqn (1)×-9
3x-9y=30....eqn(2)×-4
-45x+36y=-252
-(-12x+36y=-120)
therefore, -33x÷33 =-132÷-33
x=4.
substitute (x=4) in any of the equation. I'm just going to use eqn 1.
5x-4y=28
5(4)-4y=28
20-4y=28
-4y =28-20
-4y÷-4 = 8÷-4
y=-2
so, x=4, y=-2
Note: for proof of answers substitute the answers for x and y and see if you have the same result...e.g
5(4)-4(-2)=28.
