What is the solution to the pair of equations?
y = 7x − 9
y = 3x − 1

x = 2

Concept:

There are three general ways to solve systems of equations:

Here, we are going to use the method of substitution because [y] is isolated onto the left-hand side.

Solve:

Given information

y = 7x - 9

y = 3x - 1

Combine both equations by substitution

7x - 9 = 3x - 1

Subtract 3x on both sides

7x - 9 - 3x = 3x - 1 - 3x

4x - 9 = -1

Add 9 on both sides

4x - 9 + 9 = -1 + 9

4x = 8

Divide 4 on both sides

4x / 4 = 8 / 4

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answer

a,b, and d

explanation

a reflection angle is more than

but less than;

an angle that measures

is a reflex angle.(true)

an angle that measures less than

is acute.(true)

provided we are considering angles greater or equal to zero.

an acute angle lies in the range.

an obtuse angle is less than 180° but more than 90°

an angle that measures 300° is obtuse (false)

an angle that measures 65° is an acute angle.(true)