Question

An unknown number b is 10 more than an unknown number k. The number b is also k less than 8. The equations to find k and b are shown below.

b=k+10
b=-k+8
Which is a correct step to find k and b?
O Write the points where the graphs of the equations intersect the x-axis.
O Write the points where the graphs of the equations intersect the y-axis.
O Add the equations to eliminate k.
O Multiply the equations to eliminate b.

Answer 1

Answer: Add the equations to eliminate k

Explanation:

Adding the equations, you get 2b=18, which you can solve for b. Afterward, you can substitute this value of b back into either equation to solve for k.