Question

Angle a​ and​ ​angle b​ ​are complementary angles. The measure of ∠a is 42°.

Which equation represents this situation with x representing the measure of ∠b ?



42−x=90
90+x=42
90+42=x
42+x=90

Answer 1

Explanation:

its 42+x=90.

i did the k-12 test

Answer 2

Remember that complementary angles are the angles whose sum is 90 degrees, so for example if angle
`\alpha` and angle
`\beta` are complementary; then
`\alpha + \beta =180°`.
In our case we have an angle a whose measure is 42° and and angle b, repented by x, whose measure we don't know; similarly:

`42+x=90`
We can conclude that the equation that represents this situation with x representing the measure of ∠b is 42+x=90.