45 + 4x = 6x + 5 I don't understand how to do it can you pleas help put??

Mathematics

2 answers:

oksian1 [2.3K]3 years ago

6 0

Answer:

x = 20

Step-by-step explanation:

45 + 4x = 6x + 5

45 - 5 =6x - 4x

40 = 2x

x = 40/2

x = 20

Check:

45 + 4*20 = 6*20 + 5

45 + 80 = 120 + 5 = 125

alukav5142 [94]3 years ago

4 0

Answer:

x=20

Step-by-step explanation:

45+4x=6x+5

45=2x+5

40=2x

20=x

x=20

You might be interested in

-2x-y=-9<br> 5x-2y=18<br> substitution

KIM [24]

$-2x-y=-9 \\
5x-2y=18 \\ \\
\hbox{solve the first equation for y:} \\
-2x-y=-9 \ \ \ |+2x \\
-y=-9+2x \ \ \ |\times (-1) \\
y=9-2x \\ \\
\hbox{substitute 9-2x for y in the second equation:} \\
5x-2(9-2x)=18 \\
5x-18+4x=18 \\
9x-18=18 \ \ \ |\div 9 \\
x-2=2 \ \ \ |+2 \\
x=4 \\ \\
y=9-2x=9-2 \times 4=9-8=1 \\ \\
\boxed{(x,y)=(4,1)}$