Algebra practice question

Answer: 10

With y = x: 0.5x + 0.2x = 0.7x = 7, so x = 10.

Common wrong answers

If you answered 7

7 is the right-hand side, not x.

If you answered 14

14 comes from 0.5x = 7, ignoring the 0.2y term.

If you answered 35

35 comes from 0.2x = 7 alone.

More Algebra questions

• Easy–Medium
  A line passes through the points (0, 3) and (2, 7). What is the slope of the line?
• Easy–Medium
  A gym charges a $25 one-time signup fee plus $15 per month. Which equation gives the total cost C, in dollars,…
• Easy–Medium
  If 5(x − 2) = 3x + 4, what is the value of x?
• Easy–Medium
  A taxi charges a $3.50 base fare plus $2.25 per mile. If a ride costs $19.25 total, how many miles was the rid…
• Easy–Medium
  The equation of a line is 3x + 2y = 12. What is the y-coordinate of the point where the line crosses the y-axi…
• Easy–Medium
  A line in the xy-plane passes through the points (1, 5) and (4, 11). What is the y-intercept of the line?