Solving Equations — Unit test Answers
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The sum of three numbers is 45. The second of the three numbers is three more than twice the first number, x. The third number is two more than the first number, x. Which equation can be used to solve for the first number, x?
A
x + 5x + x + 2 = 45B
x + x + 3 + x + 2 = 45C
x + 3x + 2 + x + 2 = 45D
x + 2x + 3 + x + 2 = 4523
Which equation is equivalent to 3[x + 3(4x – 5)] = 15x – 24?
A
15x – 15 = 15x – 24B
15x – 5 = 15x – 24C
39x – 45 = 15x – 24D
39x – 15 = 15x – 2424
Three times a number, x, increased by four is equal to five times the number, x. Which equation can be used to solve for x?
A
3 x + 5 x = 4
B
3 x + 4 = 5 x
C
3 x = 4 + 5 x
D
3 x minus 4 = 5 x
25
What is the value of x in the equation 0.2(x + 1) + 0.5x = –0.3(x – 4)?
A
Negative seven-halves
B
–1C
1D
Seven-halves
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