I think it’s b it only makes since
2(2x) + 1x = 40 or 4x + 1x = 40 is the result of combining by substitution
<em><u>Solution:</u></em>
Given that we have to combine 2y + 1x = 40 and y = 2x using substitution method
The substitution method for solving systems of equations involves expressing one variable in terms of another, thus removing one variable from an equation.
<em><u>Given equations are:</u></em>
2y + 1x = 40 -------- eqn 1
y = 2x ----------- eqn 2
We can substitute eqn 2 in eqn 1
Which means, substitute y = 2x in place of y in eqn 1
2(2x) + 1x = 40
4x + 1x = 40
5x = 40
x = 8
From eqn 2,
y = 2(8)
y = 16
Thus by combining using substitution method we found the solution
Answer:
Step-by-step explanation:
hello :
-4+5|4x-4|=21
add 4 : 5|4x-4| = 25
divid by 5 : |4x-4| = 5 means : 4x-4 = 5 or 4x-4 = - 5
4x=9 or 4x =-1
x= 9/4 or x = - 1/4
