Question

Help me on problem 7a and b plz

Answer 1

Remark

The easiest way to graph this is to get a program to do it for you. Desmos is ideal.

Problem 7a

The graph is down  below the rest of the answer. 5x + 2y = 150

x and y intercepts.

The x intercept is marked as 30. That was derived by letting y = 0 to get

5x = 150   divide by 5

x = 150 / 5

x =  30

So if you buy NO wristbands, you can get 30 keychains

The y intercept occurs when x = 0

2y = 150    Divide by 2

y = 150 / 2

y = 75 That means if you buy NO keychains, you can buy 75 wrist bands.

Problem 7b

For this problem x = 18

5*18 + 2y = 150

90 + 2y = 150        Subtract 90 from both sides.

2y = 150 - 90

2y = 60                  Divide by 2

y = 60/2

y = 30

Conclusion

You can buy 18 key chains (given)

You can buy 30 wristbands (calculated)