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Sagot :
1) 3x - 2 = 7
3x = 7 + 2
3x = 9
3x/3 = 9/3
x = 3
2) 2a + 15 = 5
2a = 5 - 15
2a = -10
2a/2 = -10/2
a = - 5
3) 5 + 4b = - 11
4b = - 11 - 5
4b = - 16
4b/4 = - 16/4
b = - 4
4) x + 8 = 63
x = 63 - 8
x = 55
5) 4d - 5 = 2d + 7
4d - 2d = 7 + 5
2d = 12
2d/2 = 12/2
d = 6
6) 9c + 3 = 8c + 5
9c - 8c = 5 - 3
c = 2
7) 5(2x - 1) + 6 = 7x - 8
10x - 5 + 6 = 7x - 8
10x + 1 = 7x - 8
10x - 7x = -8 -1
3x = -9
3x/3 = -9/3
x = -3
8) 4y + 5 = 2y + 73
4y- 2y = 73 - 5
2y = 72
y = 36
9) 4x = 2x + 8
4x - 2x = 8
2x = 8
2x/2 = 8/2
x = 4
10) 10m - 10 = 10
10m = 10 + 10
10m = 20
10m/10 = 20/10
m = 2
(Note: I hope you posted items 4 and 8 correctly :-)
3x = 7 + 2
3x = 9
3x/3 = 9/3
x = 3
2) 2a + 15 = 5
2a = 5 - 15
2a = -10
2a/2 = -10/2
a = - 5
3) 5 + 4b = - 11
4b = - 11 - 5
4b = - 16
4b/4 = - 16/4
b = - 4
4) x + 8 = 63
x = 63 - 8
x = 55
5) 4d - 5 = 2d + 7
4d - 2d = 7 + 5
2d = 12
2d/2 = 12/2
d = 6
6) 9c + 3 = 8c + 5
9c - 8c = 5 - 3
c = 2
7) 5(2x - 1) + 6 = 7x - 8
10x - 5 + 6 = 7x - 8
10x + 1 = 7x - 8
10x - 7x = -8 -1
3x = -9
3x/3 = -9/3
x = -3
8) 4y + 5 = 2y + 73
4y- 2y = 73 - 5
2y = 72
y = 36
9) 4x = 2x + 8
4x - 2x = 8
2x = 8
2x/2 = 8/2
x = 4
10) 10m - 10 = 10
10m = 10 + 10
10m = 20
10m/10 = 20/10
m = 2
(Note: I hope you posted items 4 and 8 correctly :-)
I'll just tell you HOW to solve, but I won't solve EVERYTHING.
1.) 3x-2=7
3x=7+2 (Transpose 2 to isolate the variables from the real nos. Its sign will be its
opposite value)
3x=9 (Simplify)
3x = 9
3 3 (Divide both sides with the numerical of the varaiable)
x = 3 (Simplify and Viola!)
2.) 2a + 15 = 5
2a = 5 -15 (Transpose)
2a = -10 (Simplify)
2a = -10
2 2 (Divide by coefficient)
a = -5
If you want to check if your answer is correct, substitute your answer to the variable in the original equation.
1. 3x-2=7
x = 3
So, 3(3)-2=7
9-2=7
7=7
2. 2a+15=5
a=-5
So, 2(-5)+15=5
-10+15=5
5=5
Try answering the rest! :)
1.) 3x-2=7
3x=7+2 (Transpose 2 to isolate the variables from the real nos. Its sign will be its
opposite value)
3x=9 (Simplify)
3x = 9
3 3 (Divide both sides with the numerical of the varaiable)
x = 3 (Simplify and Viola!)
2.) 2a + 15 = 5
2a = 5 -15 (Transpose)
2a = -10 (Simplify)
2a = -10
2 2 (Divide by coefficient)
a = -5
If you want to check if your answer is correct, substitute your answer to the variable in the original equation.
1. 3x-2=7
x = 3
So, 3(3)-2=7
9-2=7
7=7
2. 2a+15=5
a=-5
So, 2(-5)+15=5
-10+15=5
5=5
Try answering the rest! :)
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